diff --git a/src/ast/sls/bv_sls_eval.cpp b/src/ast/sls/bv_sls_eval.cpp
index 5201947da..2649d6f09 100644
--- a/src/ast/sls/bv_sls_eval.cpp
+++ b/src/ast/sls/bv_sls_eval.cpp
@@ -366,7 +366,7 @@ namespace bv {
             unsigned bw = 0;
             for (unsigned i = e->get_num_args(); i-- > 0; ) {
                 auto const& a = wval(e->get_arg(i));
-                for (unsigned j = 0; j < a.bw; ++j)
+                for (unsigned j = 0; false && j < a.bw; ++j)
                     val.eval.set(j + bw, a.get_bit(j));
                 bw += a.bw;
             }
@@ -1269,6 +1269,7 @@ namespace bv {
     }
 
     bool sls_eval::try_repair_ule(bool e, bvval& a, bvval const& b) {
+        verbose_stream() << "try-repair-ule " << e << " " << a << " " << b << "\n";
         if (e) {
             // a <= t
             return a.set_random_at_most(b.bits(),  m_rand);
@@ -1284,6 +1285,7 @@ namespace bv {
     }
 
     bool sls_eval::try_repair_uge(bool e, bvval& a, bvval const& b) {
+        verbose_stream() << "try-repair-uge " << e << " " << a << " " << b << "\n";
         if (e) {
             // a >= t
             return a.set_random_at_least(b.bits(), m_rand);
@@ -1821,7 +1823,7 @@ namespace bv {
     bool sls_eval::try_repair_concat(app* e, unsigned idx) {
         unsigned bw = 0;
         auto& ve = assign_value(e);
-        for (unsigned j = 0; j < idx; ++j)
+        for (unsigned j = e->get_num_args() - 1; j > idx; --j)
             bw += bv.get_bv_size(e->get_arg(j));
         auto& a = wval(e, idx);
         for (unsigned i = 0; i < a.bw; ++i)
@@ -1923,7 +1925,6 @@ namespace bv {
     void sls_eval::commit_eval(app* e) {
         if (!bv.is_bv(e))
             return;
-        // verbose_stream() << mk_bounded_pp(e, m) << " " << wval(e) << "\n";
         //
         SASSERT(wval(e).commit_eval());
         VERIFY(wval(e).commit_eval());
@@ -1939,7 +1940,9 @@ namespace bv {
             return false;
         if (m.is_bool(e))
             return bval0(e) == bval1(e);
-        if (bv.is_bv(e)) {            
+        if (bv.is_bv(e)) {
+            if (m.is_ite(e))
+                return true;
             auto const& v = eval(e);
             return v.eval == v.bits();
         }
diff --git a/src/ast/sls/bv_sls_fixed.cpp b/src/ast/sls/bv_sls_fixed.cpp
index b93ebe578..eac8f69c6 100644
--- a/src/ast/sls/bv_sls_fixed.cpp
+++ b/src/ast/sls/bv_sls_fixed.cpp
@@ -285,17 +285,21 @@ namespace bv {
         if (!is_app(_e))
             return;
         auto e = to_app(_e);
-        if (!bv.is_bv(e))
-            return;
-
-        auto& v = ev.wval(e);
-        if (all_of(*e, [&](expr* arg) { return ev.is_fixed0(arg); })) {
-            for (unsigned i = 0; i < v.bw; ++i)
-                v.fixed.set(i, true);
+        
+        if (e->get_family_id() == bv.get_family_id() && all_of(*e, [&](expr* arg) { return ev.is_fixed0(arg); })) {
+            if (bv.is_bv(e)) {    
+                auto& v = ev.wval(e);
+                for (unsigned i = 0; i < v.bw; ++i)
+                    v.fixed.set(i, true);
+            }
             ev.m_fixed.setx(e->get_id(), true, false);
             return;
         }
 
+        if (!bv.is_bv(e))
+            return;
+        auto& v = ev.wval(e);
+
         if (m.is_ite(e)) {
             auto& val_th = ev.wval(e->get_arg(1));
             auto& val_el = ev.wval(e->get_arg(2));
diff --git a/src/ast/sls/sls_bv_plugin.cpp b/src/ast/sls/sls_bv_plugin.cpp
index 4eeca0702..efb56670a 100644
--- a/src/ast/sls/sls_bv_plugin.cpp
+++ b/src/ast/sls/sls_bv_plugin.cpp
@@ -85,9 +85,12 @@ namespace sls {
     }
 
     bool bv_plugin::is_sat() {
+        bool is_sat = true;
         for (auto t : ctx.subterms())
-            if (is_app(t) && bv.is_bv(t) && !m_eval.eval_is_correct(to_app(t)))
-                return false;
+            if (is_app(t) && bv.is_bv(t) && to_app(t)->get_family_id() == bv.get_fid() && !m_eval.eval_is_correct(to_app(t))) {
+                ctx.new_value_eh(t);
+                is_sat = false;
+            }
         return true;
     }
     
@@ -107,38 +110,44 @@ namespace sls {
 
     bool bv_plugin::repair_down(app* e) {
         unsigned n = e->get_num_args();
+        bool status = true;
         if (n == 0 || m_eval.is_uninterpreted(e) || m_eval.eval_is_correct(e)) 
-            return true;        
-
+            goto done;
+        
         if (n == 2) {
             auto d1 = get_depth(e->get_arg(0));
             auto d2 = get_depth(e->get_arg(1));
             unsigned s = ctx.rand(d1 + d2 + 2);
             if (s <= d1 && m_eval.repair_down(e, 0)) 
-                return true;
+                goto done;
             
             if (m_eval.repair_down(e, 1)) 
-                return true;
+                goto done;
             
             if (m_eval.repair_down(e, 0)) 
-                return true;            
+                goto done;
         }
         else {
             unsigned s = ctx.rand(n);
             for (unsigned i = 0; i < n; ++i) {
                 auto j = (i + s) % n;
                 if (m_eval.repair_down(e, j)) 
-                    return true;                
+                    goto done;
             }
         }
-        return false;
+        status = false;
+        
+    done:
+        log(e, false, status);
+        return status;
     }
 
     void bv_plugin::repair_up(app* e) {
         if (m_eval.repair_up(e)) {
             if (!m_eval.eval_is_correct(e)) {
-                verbose_stream() << "incorrect eval #" << e->get_id() << " " << mk_bounded_pp(e, m) << "\n";
+                verbose_stream() << "Incorrect eval #" << e->get_id() << " " << mk_bounded_pp(e, m) << "\n";
             }
+            log(e, true, true);
             SASSERT(m_eval.eval_is_correct(e));
             if (m.is_bool(e)) {
                 if (ctx.is_true(e) != m_eval.bval1(e))
@@ -148,10 +157,14 @@ namespace sls {
                 ctx.new_value_eh(e);
         }
         else if (bv.is_bv(e)) {
+            log(e, true, false);
             IF_VERBOSE(5, verbose_stream() << "repair-up "; trace_repair(true, e));             
             m_eval.set_random(e);
             ctx.new_value_eh(e);
         }
+        else
+            log(e, true, false);
+
     }
 
     void bv_plugin::repair_literal(sat::literal lit) {
@@ -175,4 +188,14 @@ namespace sls {
         IF_VERBOSE(2, verbose_stream()
             << "(bvsls :restarts " << m_stats.m_restarts << ")\n");
     }
-}
\ No newline at end of file
+
+    void bv_plugin::log(expr* e, bool up_down, bool success) {
+        //        unsigned value = 0;
+        // if (bv.is_bv(e))
+        //    value = svector_hash<unsigned_hash>()(m_eval.wval(e).bits());
+        IF_VERBOSE(2, verbose_stream() << mk_bounded_pp(e, m) << " " << (up_down?"u":"d") << " " << (success ? "S" : "F");
+                   // if (bv.is_bv(e)) verbose_stream() << " " << m_eval.wval(e).bits();
+                   verbose_stream() << "\n");
+    }
+
+}
diff --git a/src/ast/sls/sls_bv_plugin.h b/src/ast/sls/sls_bv_plugin.h
index a8fa08dd0..f85a741ca 100644
--- a/src/ast/sls/sls_bv_plugin.h
+++ b/src/ast/sls/sls_bv_plugin.h
@@ -36,6 +36,8 @@ namespace sls {
         bool can_propagate();
         bool is_bv_predicate(expr* e);
 
+        void log(expr* e, bool up_down, bool success); 
+
     public:
         bv_plugin(context& ctx);
         ~bv_plugin() override {}
diff --git a/src/ast/sls/sls_context.cpp b/src/ast/sls/sls_context.cpp
index e04db76f1..076bef5ad 100644
--- a/src/ast/sls/sls_context.cpp
+++ b/src/ast/sls/sls_context.cpp
@@ -86,8 +86,6 @@ namespace sls {
             if (m_new_constraint || !unsat().empty())
                 return l_undef;
 
-            //verbose_stream() << unsat().size() << " " << m_new_constraint << "\n";
-
             if (all_of(m_plugins, [&](auto* p) { return !p || p->is_sat(); })) {
                 model_ref mdl = alloc(model, m);
                 for (expr* e : subterms()) 
diff --git a/src/ast/sls/sls_valuation.h b/src/ast/sls/sls_valuation.h
index 66d7e0281..cb1a478c3 100644
--- a/src/ast/sls/sls_valuation.h
+++ b/src/ast/sls/sls_valuation.h
@@ -135,6 +135,7 @@ namespace bv {
         digit_t bits(unsigned i) const { return m_bits[i]; }
         bvect const& bits() const { return m_bits; }
         bool commit_eval();
+        bool is_fixed() const { for (unsigned i = bw; i-- > 0; ) if (!fixed.get(i)) return false; return true; }
 
         bool get_bit(unsigned i) const { return m_bits.get(i); }
         bool try_set_bit(unsigned i, bool b) {