diff --git a/src/api/dotnet/Deprecated.cs b/src/api/dotnet/Deprecated.cs
index 7282796ec..7dc524834 100644
--- a/src/api/dotnet/Deprecated.cs
+++ b/src/api/dotnet/Deprecated.cs
@@ -94,7 +94,6 @@ namespace Microsoft.Z3
         /// <summary>
         /// Retrieves an assignment to atomic propositions for a satisfiable context.
         /// </summary>
-        /// <seealso cref="Pop"/>
          public static BoolExpr GetAssignment(Context ctx) 
          {
              IntPtr x = Native.Z3_get_context_assignment(ctx.nCtx);
diff --git a/src/opt/maxres.cpp b/src/opt/maxres.cpp
index 86c0efb8f..be39a05d5 100644
--- a/src/opt/maxres.cpp
+++ b/src/opt/maxres.cpp
@@ -356,9 +356,9 @@ public:
             while (index < asms.size() && is_sat == l_true) {
                 while (asms.size() > 20*(index - last_index) && index < asms.size()) {
                     index = next_index(asms, index);
-                    //std::cout << "weight: " << get_weight(asms[index-1].get()) << "\n";
                     //break;
                 }
+                IF_VERBOSE(3, verbose_stream() << "weight: " << get_weight(asms[0].get()) << " " << get_weight(asms[index-1].get()) << "\n";);
                 last_index = index;
                 is_sat = s().check_sat(index, asms.c_ptr());
             }            
diff --git a/src/test/udoc_relation.cpp b/src/test/udoc_relation.cpp
index dd77db9f8..31908a41d 100644
--- a/src/test/udoc_relation.cpp
+++ b/src/test/udoc_relation.cpp
@@ -146,6 +146,8 @@ public:
 
         test_filter_neg4(false);
         test_filter_neg4(true);
+        test_filter_neg6(false);
+        test_filter_neg6(true);
 
         test_filter_neg();
         test_filter_neg2();
@@ -658,6 +660,35 @@ public:
         neg->deallocate();        
     }
 
+    void test_filter_neg5(bool disable_fast) {
+        relation_signature sig1, sig2;
+        sig1.push_back(bv.mk_sort(2));
+        sig1.push_back(bv.mk_sort(2));
+        sig2.push_back(bv.mk_sort(2));
+        sig2.push_back(bv.mk_sort(2));
+        sig2.push_back(bv.mk_sort(2));
+        unsigned_vector cols1, cols2, cols3;
+
+        cols1.push_back(0);
+        cols1.push_back(1);
+        cols2.push_back(0);
+        cols2.push_back(2);
+        cols3.push_back(0);
+        cols3.push_back(1);
+        cols3.push_back(2);
+        udoc_relation* tgt = mk_full(sig1);
+        udoc_relation* neg = mk_full(sig2);
+        rel_mut filter_id = p.mk_filter_identical_fn(*tgt, cols3.size(), cols3.c_ptr());
+        (*filter_id)(*tgt);
+        if (disable_fast) p.disable_fast_pass();
+        apply_filter_neg(*tgt, *neg, cols1, cols2);
+        tgt->deallocate();
+        neg->deallocate();        
+    }
+
+    // TBD: unit test to expose similar bug as projection had.
+    // you can't just remove columns when there are side-constraints in neg.
+
     void set_random(udoc_relation& r, unsigned num_vals) {
         unsigned num_bits = r.get_dm().num_tbits();
         udoc_relation* full = mk_full(r.get_signature());