diff --git a/src/ast/rewriter/th_rewriter.cpp b/src/ast/rewriter/th_rewriter.cpp
index aa02ab009..f7ac45ff5 100644
--- a/src/ast/rewriter/th_rewriter.cpp
+++ b/src/ast/rewriter/th_rewriter.cpp
@@ -826,7 +826,6 @@ struct th_rewriter_cfg : public default_rewriter_cfg {
         result = elim_unused_vars(m(), q1, params_ref());
 
 
-        TRACE("reduce_quantifier", tout << "after elim_unused_vars:\n" << result << "\n";);
 
         result_pr = nullptr;
         if (m().proofs_enabled()) {
@@ -835,6 +834,9 @@ struct th_rewriter_cfg : public default_rewriter_cfg {
                 p2 = m().mk_elim_unused_vars(q1, result);
             result_pr = m().mk_transitivity(p1, p2);
         }
+
+        TRACE("reduce_quantifier", tout << "after elim_unused_vars:\n" << result << " " << result_pr << "\n" ;);
+
         SASSERT(old_q->get_sort() == result->get_sort());
         return true;
     }
diff --git a/src/cmd_context/cmd_context.cpp b/src/cmd_context/cmd_context.cpp
index 0c38f2e4a..8fb859b88 100644
--- a/src/cmd_context/cmd_context.cpp
+++ b/src/cmd_context/cmd_context.cpp
@@ -621,10 +621,15 @@ void cmd_context::set_produce_unsat_cores(bool f) {
 }
 
 void cmd_context::set_produce_proofs(bool f) {
-    SASSERT(!has_assertions() || m_params.m_proof == f);
-    if (has_manager()) 
+    if (m_params.m_proof == f)
+        return;
+    SASSERT(!has_assertions());
+    if (has_manager()) {
         m().toggle_proof_mode(f ? PGM_ENABLED : PGM_DISABLED);
+        std::cout << m_params.m_proof << " " << f << "\n";
+    }
     m_params.m_proof = f;
+    mk_solver();
 }
 
 
diff --git a/src/solver/assertions/asserted_formulas.cpp b/src/solver/assertions/asserted_formulas.cpp
index 5dec90ba7..630d73945 100644
--- a/src/solver/assertions/asserted_formulas.cpp
+++ b/src/solver/assertions/asserted_formulas.cpp
@@ -171,7 +171,7 @@ void asserted_formulas::assert_expr(expr * e, proof * _in_pr) {
             else
                 pr = m.mk_modus_ponens(in_pr, pr);
         }
-        TRACE("assert_expr_bug", tout << "after...\n" << r << "\n";);
+        TRACE("assert_expr_bug", tout << "after...\n" << r << "\n" << pr << "\n";);
     }
 
     m_has_quantifiers |= ::has_quantifiers(e);