diff --git a/src/math/polynomial/polynomial.cpp b/src/math/polynomial/polynomial.cpp
index f5d96e740..3f1883749 100644
--- a/src/math/polynomial/polynomial.cpp
+++ b/src/math/polynomial/polynomial.cpp
@@ -4117,7 +4117,6 @@ namespace polynomial {
             polynomial_ref H(m_wrapper), C(m_wrapper);
             polynomial_ref lc_H(m_wrapper);
             unsigned min_deg_q = UINT_MAX;
-            var next_x         = vars[idx+1];
             unsigned counter   = 0;
 
             for (;; counter++) {
@@ -4137,7 +4136,7 @@ namespace polynomial {
                 var q_var      = max_var(q);
                 unsigned deg_q = q_var == null_var ? 0 : degree(q, q_var);
                 TRACE("mgcd_detail", tout << "counter: " << counter << "\nidx: " << idx << "\nq: " << q << "\ndeg_q: " << deg_q << "\nmin_deg_q: " << 
-                      min_deg_q << "\nnext_x: x" << next_x << "\nmax_var(q): " << q_var << "\n";);
+                      min_deg_q << "\nnext_x: x" << vars[idx+1] << "\nmax_var(q): " << q_var << "\n";);
                 if (deg_q < min_deg_q) {
                     TRACE("mgcd_detail", tout << "reseting...\n";);                    
                     counter   = 0;
@@ -5113,10 +5112,9 @@ namespace polynomial {
                 monomial const * m_r = R.m(max_R);
                 numeral const & a_r  = R.a(max_R);
                 monomial * m_r_q = 0;
-                bool q_div_r = div(m_r, m_q, m_r_q);
+                VERIFY(div(m_r, m_q, m_r_q));
                 TRACE("polynomial", tout << "m_r: "; m_r->display(tout); tout << "\nm_q: "; m_q->display(tout); tout << "\n";
                       if (m_r_q) { tout << "m_r_q: "; m_r_q->display(tout); tout << "\n"; });
-                SASSERT(q_div_r);
                 m_r_q_ref = m_r_q;
                 m_manager.div(a_r, a_q, a_r_q);
                 C.add(a_r_q, m_r_q);       // C <- C + (a_r/a_q)*(m_r/m_q)
diff --git a/src/sat/sat_config.cpp b/src/sat/sat_config.cpp
index d2a662b64..aff023b22 100644
--- a/src/sat/sat_config.cpp
+++ b/src/sat/sat_config.cpp
@@ -68,7 +68,10 @@ namespace sat {
         m_restart_factor  = p.restart_factor();
         
         m_random_freq     = p.random_freq();
-
+        m_random_seed     = p.random_seed();
+        if (m_random_seed == 0) 
+            m_random_seed = _p.get_uint("random_seed", 0);
+        
         m_burst_search    = p.burst_search();
         
         m_max_conflicts   = p.max_conflicts();
diff --git a/src/sat/sat_config.h b/src/sat/sat_config.h
index 021810f3d..61ab71605 100644
--- a/src/sat/sat_config.h
+++ b/src/sat/sat_config.h
@@ -53,6 +53,7 @@ namespace sat {
         unsigned           m_restart_initial;
         double             m_restart_factor; // for geometric case
         double             m_random_freq;
+        unsigned           m_random_seed;
         unsigned           m_burst_search;
         unsigned           m_max_conflicts;
 
diff --git a/src/sat/sat_params.pyg b/src/sat/sat_params.pyg
index 1e2551740..c5ac97b4e 100644
--- a/src/sat/sat_params.pyg
+++ b/src/sat/sat_params.pyg
@@ -9,6 +9,7 @@ def_module_params('sat',
                           ('restart.initial', UINT, 100, 'initial restart (number of conflicts)'),
                           ('restart.factor', DOUBLE, 1.5, 'restart increment factor for geometric strategy'),
                           ('random_freq', DOUBLE, 0.01, 'frequency of random case splits'),
+                          ('random_seed', UINT, 0, 'random seed'),
                           ('burst_search', UINT, 100, 'number of conflicts before first global simplification'),
                           ('max_conflicts', UINT, UINT_MAX, 'maximum number of conflicts'),
                           ('gc', SYMBOL, 'glue_psm', 'garbage collection strategy: psm, glue, glue_psm, dyn_psm'),
diff --git a/src/sat/sat_simplifier.cpp b/src/sat/sat_simplifier.cpp
index 0fa88d629..285df1e78 100644
--- a/src/sat/sat_simplifier.cpp
+++ b/src/sat/sat_simplifier.cpp
@@ -922,6 +922,7 @@ namespace sat {
             if (s.is_external(l.var()) || s.was_eliminated(l.var())) 
                 return;
             {
+
                 m_to_remove.reset();
                 {
                     clause_use_list & occs = s.m_use_list.get(l);
@@ -1341,6 +1342,7 @@ namespace sat {
         }
         TRACE("resolution", tout << "found var to eliminate, before: " << before_clauses << " after: " << after_clauses << "\n";);
 
+        
         // eliminate variable
         model_converter::entry & mc_entry = s.m_mc.mk(model_converter::ELIM_VAR, v);
         save_clauses(mc_entry, m_pos_cls);
diff --git a/src/sat/sat_solver.cpp b/src/sat/sat_solver.cpp
index 86c81f071..a2d39d3ea 100644
--- a/src/sat/sat_solver.cpp
+++ b/src/sat/sat_solver.cpp
@@ -49,7 +49,7 @@ namespace sat {
         m_qhead(0),
         m_scope_lvl(0),
         m_params(p) {
-        m_config.updt_params(p);
+        updt_params(p);
         m_conflicts_since_gc      = 0;
         m_conflicts               = 0;
         m_next_simplify           = 0;
@@ -2358,7 +2358,7 @@ namespace sat {
         m_asymm_branch.updt_params(p);
         m_probing.updt_params(p);
         m_scc.updt_params(p);
-        m_rand.set_seed(p.get_uint("random_seed", 0));
+        m_rand.set_seed(m_config.m_random_seed);
     }
 
     void solver::collect_param_descrs(param_descrs & d) {
diff --git a/src/smt/smt_context.cpp b/src/smt/smt_context.cpp
index f68df30ab..6b6223385 100644
--- a/src/smt/smt_context.cpp
+++ b/src/smt/smt_context.cpp
@@ -1616,6 +1616,8 @@ namespace smt {
             unsigned qhead = m_qhead;
             if (!bcp())
                 return false;
+            if (m_cancel_flag) 
+                return true;
             SASSERT(!inconsistent());
             propagate_relevancy(qhead);
             if (inconsistent()) 
@@ -3950,7 +3952,7 @@ namespace smt {
               m_fingerprints.display(tout); 
               );
         failure fl = get_last_search_failure();
-        if (fl == TIMEOUT || fl == MEMOUT || fl == CANCELED || fl == NUM_CONFLICTS || fl == THEORY) {
+        if (fl == TIMEOUT || fl == MEMOUT || fl == CANCELED || fl == NUM_CONFLICTS) {
             // don't generate model.
             return;
         }
diff --git a/src/smt/theory_arith_core.h b/src/smt/theory_arith_core.h
index 7414eda83..89ce99524 100644
--- a/src/smt/theory_arith_core.h
+++ b/src/smt/theory_arith_core.h
@@ -1274,8 +1274,10 @@ namespace smt {
             }
         }
         while (m_final_check_idx != old_idx);
-        if (result == FC_DONE && m_found_unsupported_op)
+        if (result == FC_DONE && m_found_unsupported_op) {
+            TRACE("arith", tout << "Found unsupported operation\n";);
             result = FC_GIVEUP;
+        }
         return result;
     }
 
diff --git a/src/smt/theory_arith_int.h b/src/smt/theory_arith_int.h
index 4b5388062..b600dd3c0 100644
--- a/src/smt/theory_arith_int.h
+++ b/src/smt/theory_arith_int.h
@@ -1299,8 +1299,10 @@ namespace smt {
               }
               tout << "max: " << max << ", min: " << min << "\n";);
 
-        if (m_params.m_arith_ignore_int)
+        if (m_params.m_arith_ignore_int) {
+            TRACE("arith", tout << "Ignore int: give up\n";);
             return FC_GIVEUP;
+        }
 
         if (!gcd_test())
             return FC_CONTINUE;
diff --git a/src/smt/theory_arith_nl.h b/src/smt/theory_arith_nl.h
index d02c9e540..6a7017a29 100644
--- a/src/smt/theory_arith_nl.h
+++ b/src/smt/theory_arith_nl.h
@@ -2314,13 +2314,15 @@ namespace smt {
             return FC_DONE;
         }
 
-        if (!m_params.m_nl_arith)
+        if (!m_params.m_nl_arith) {
+            TRACE("non_linear", tout << "Non-linear is not enabled\n";);
             return FC_GIVEUP;
+        }
 
         TRACE("process_non_linear", display(tout););
 
         if (m_nl_rounds > m_params.m_nl_arith_rounds) {
-            TRACE("non_linear", tout << "GIVE UP non linear problem...\n";);
+            TRACE("non_linear", tout << "GIVEUP non linear problem...\n";);
             IF_VERBOSE(3, verbose_stream() << "Max. non linear arithmetic rounds. Increase threshold using NL_ARITH_ROUNDS=<limit>\n";);
             return FC_GIVEUP;
         }
diff --git a/src/smt/theory_diff_logic_def.h b/src/smt/theory_diff_logic_def.h
index 85f7f948a..b1f3483a9 100644
--- a/src/smt/theory_diff_logic_def.h
+++ b/src/smt/theory_diff_logic_def.h
@@ -1066,11 +1066,8 @@ template<typename Ext>
 void theory_diff_logic<Ext>::get_eq_antecedents(
     theory_var v1, theory_var v2, unsigned timestamp, conflict_resolution & cr) {
     imp_functor functor(cr);
-    bool r;
-    r = m_graph.find_shortest_zero_edge_path(v1, v2, timestamp, functor);
-    SASSERT(r);
-    r = m_graph.find_shortest_zero_edge_path(v2, v1, timestamp, functor);
-    SASSERT(r);
+    VERIFY(m_graph.find_shortest_zero_edge_path(v1, v2, timestamp, functor));
+    VERIFY(m_graph.find_shortest_zero_edge_path(v2, v1, timestamp, functor));
 }
 
 template<typename Ext>
diff --git a/src/util/bit_vector.cpp b/src/util/bit_vector.cpp
index b8cbdade2..f0e9e9c67 100644
--- a/src/util/bit_vector.cpp
+++ b/src/util/bit_vector.cpp
@@ -138,9 +138,8 @@ bool bit_vector::operator==(bit_vector const & source) const {
 bit_vector & bit_vector::operator|=(bit_vector const & source) {
     if (size() < source.size())
         resize(source.size(), false);
-    unsigned n1 = num_words();
     unsigned n2 = source.num_words();
-    SASSERT(n2 <= n1);
+    SASSERT(n2 <= num_words());
     unsigned bit_rest = source.m_num_bits % 32;
     if (bit_rest == 0) {
         unsigned i = 0;
diff --git a/src/util/cmd_context_types.h b/src/util/cmd_context_types.h
index b0a0226e8..e334dc0d2 100644
--- a/src/util/cmd_context_types.h
+++ b/src/util/cmd_context_types.h
@@ -55,12 +55,12 @@ class cmd_exception : public default_exception {
     }
 public:
     cmd_exception(char const * msg):default_exception(msg), m_line(-1), m_pos(-1) {}
-    cmd_exception(std::string const & msg):default_exception(msg.c_str()), m_line(-1), m_pos(-1) {}
-    cmd_exception(std::string const & msg, int line, int pos):default_exception(msg.c_str()), m_line(line), m_pos(pos) {}
+    cmd_exception(std::string const & msg):default_exception(msg), m_line(-1), m_pos(-1) {}
+    cmd_exception(std::string const & msg, int line, int pos):default_exception(msg), m_line(line), m_pos(pos) {}
     cmd_exception(char const * msg, symbol const & s): 
-        default_exception(compose(msg,s).c_str()),m_line(-1),m_pos(-1) {}
+        default_exception(compose(msg,s)),m_line(-1),m_pos(-1) {}
     cmd_exception(char const * msg, symbol const & s, int line, int pos): 
-        default_exception(compose(msg,s).c_str()),m_line(line),m_pos(pos) {}
+        default_exception(compose(msg,s)),m_line(line),m_pos(pos) {}
 
     bool has_pos() const { return m_line >= 0; }
     int line() const { SASSERT(has_pos()); return m_line; }
diff --git a/src/util/mpf.cpp b/src/util/mpf.cpp
index 8cb6ed4fc..f5785c072 100644
--- a/src/util/mpf.cpp
+++ b/src/util/mpf.cpp
@@ -120,7 +120,8 @@ void mpf_manager::set(mpf & o, unsigned ebits, unsigned sbits, double value) {
     // double === mpf(11, 53)
     COMPILE_TIME_ASSERT(sizeof(double) == 8);
 
-    uint64 raw = *reinterpret_cast<uint64*>(&value);
+    uint64 raw;
+    memcpy(&raw, &value, sizeof(double));
     bool sign = (raw >> 63) != 0;
     int64 e =  ((raw & 0x7FF0000000000000ull) >> 52) - 1023;
     uint64 s = raw & 0x000FFFFFFFFFFFFFull;
@@ -155,7 +156,8 @@ void mpf_manager::set(mpf & o, unsigned ebits, unsigned sbits, float value) {
     // single === mpf(8, 24)
     COMPILE_TIME_ASSERT(sizeof(float) == 4);
 
-    unsigned int raw = *reinterpret_cast<unsigned int*>(&value);
+    unsigned int raw;
+    memcpy(&raw, &value, sizeof(float));
     bool sign = (raw >> 31) != 0;
     signed int e = ((raw & 0x7F800000) >> 23) - 127;
     unsigned int s = raw & 0x007FFFFF;
@@ -1288,7 +1290,9 @@ double mpf_manager::to_double(mpf const & x) {
     if (x.sign) 
         raw = raw | 0x8000000000000000ull;
 
-    return *reinterpret_cast<double*>(&raw);
+    double ret;
+    memcpy(&ret, &raw, sizeof(double));
+    return ret;
 }
 
 float mpf_manager::to_float(mpf const & x) {
@@ -1318,7 +1322,9 @@ float mpf_manager::to_float(mpf const & x) {
     if (x.sign)
         raw = raw | 0x80000000;
 
-    return *reinterpret_cast<float*>(&raw);
+    float ret;
+    memcpy(&ret, &raw, sizeof(float));
+    return ret;
 }
 
 bool mpf_manager::is_nan(mpf const & x) {
@@ -1679,7 +1685,7 @@ void mpf_manager::round(mpf_rounding_mode rm, mpf & o) {
     TRACE("mpf_dbg", tout << "OVF2 = " << OVF2 << std::endl;);
     TRACE("mpf_dbg", tout << "o_has_max_exp = " << o_has_max_exp << std::endl;);
 
-    if (!OVFen && SIGovf && o_has_max_exp)
+    if (!OVFen && OVF2)
         mk_round_inf(rm, o);
     else {        
         const mpz & p = m_powers2(o.sbits-1);
diff --git a/src/util/mpff.cpp b/src/util/mpff.cpp
index 892a7fe24..7678a051e 100644
--- a/src/util/mpff.cpp
+++ b/src/util/mpff.cpp
@@ -43,8 +43,7 @@ mpff_manager::mpff_manager(unsigned prec, unsigned initial_capacity) {
     for (unsigned i = 0; i < MPFF_NUM_BUFFERS; i++)
         m_buffers[i].resize(2 * prec, 0);
     // Reserve space for zero
-    unsigned zero_sig_idx = m_id_gen.mk();
-    SASSERT(zero_sig_idx == 0);
+    VERIFY(m_id_gen.mk() == 0);
     set(m_one, 1);
 }
 
diff --git a/src/util/mpfx.cpp b/src/util/mpfx.cpp
index cf6f8338f..c0b3a1936 100644
--- a/src/util/mpfx.cpp
+++ b/src/util/mpfx.cpp
@@ -38,8 +38,7 @@ mpfx_manager::mpfx_manager(unsigned int_sz, unsigned frac_sz, unsigned initial_c
     m_buffer0.resize(2*m_total_sz, 0);
     m_buffer1.resize(2*m_total_sz, 0);
     m_buffer2.resize(2*m_total_sz, 0);
-    unsigned zero_sig_idx = m_id_gen.mk();
-    SASSERT(zero_sig_idx == 0);
+    VERIFY(m_id_gen.mk() == 0);
     set(m_one, 1);
 }
 
diff --git a/src/util/mpq.cpp b/src/util/mpq.cpp
index eda937029..df4d207a6 100644
--- a/src/util/mpq.cpp
+++ b/src/util/mpq.cpp
@@ -235,6 +235,9 @@ void mpq_manager<SYNCH>::set(mpq & a, char const * val) {
                     SASSERT(str[0] - '0' <= 9);
                     exp = (10*exp) + (str[0] - '0');
                 }
+                else if ('/' == str[0]) {
+                    throw default_exception("mixing rational/scientific notation");
+                }
                 TRACE("mpq_set", tout << "[exp]: " << exp << ", str[0]: " << (str[0] - '0') << std::endl;);
                 ++str;
             }
diff --git a/src/util/util.h b/src/util/util.h
index eb24ece13..cbc19b759 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -24,9 +24,6 @@ Revision History:
 #include<iostream>
 #include<climits>
 #include<limits>
-#ifdef _MSC_VER
-#include<intrin.h>
-#endif
 
 #ifndef SIZE_MAX
 #define SIZE_MAX std::numeric_limits<std::size_t>::max()
@@ -99,9 +96,7 @@ COMPILE_TIME_ASSERT(sizeof(unsigned) == 4);
 
 // Return the number of 1 bits in v.
 static inline unsigned get_num_1bits(unsigned v) {
-#ifdef _MSC_VER
-    return __popcnt(v);
-#elif defined(__GNUC__)
+#ifdef __GNUC__
     return __builtin_popcount(v);
 #else
 #ifdef Z3DEBUG