diff --git a/src/main.cpp b/src/main.cpp
index 307d1d460..0c03f4f40 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3448,13 +3448,25 @@ bool TestBlockValidity(CValidationState &state, const CBlock& block, CBlockIndex
 
     // NOTE: CheckBlockHeader is called by CheckBlock
     if (!ContextualCheckBlockHeader(block, state, pindexPrev))
+    {
+        fprintf(stderr,"TestBlockValidity failure A\n");
         return false;
+    }
     if (!CheckBlock(indexDummy.nHeight,0,block, state, verifier, fCheckPOW, fCheckMerkleRoot))
+    {
+        fprintf(stderr,"TestBlockValidity failure B\n");
         return false;
+    }
     if (!ContextualCheckBlock(block, state, pindexPrev))
+    {
+        fprintf(stderr,"TestBlockValidity failure C\n");
         return false;
+    }
     if (!ConnectBlock(block, state, &indexDummy, viewNew, true))
+    {
+        fprintf(stderr,"TestBlockValidity failure D\n");
         return false;
+    }
     assert(state.IsValid());
 
     return true;
diff --git a/src/miner.cpp b/src/miner.cpp
index c3e14b343..597b5e400 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -426,7 +426,9 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
         CValidationState state;
         if ( !TestBlockValidity(state, *pblock, pindexPrev, false, false))
         {
-            fprintf(stderr,"warning: testblockvalidity failed\n");
+            static uint32_t counter;
+            if ( counter++ < 100 )
+                fprintf(stderr,"warning: testblockvalidity failed\n");
             return(0);
             //throw std::runtime_error("CreateNewBlock(): TestBlockValidity failed");
         }
@@ -615,7 +617,7 @@ void static BitcoinMiner(CWallet *pwallet)
             CBlockTemplate *ptr = CreateNewBlockWithKey(reservekey);
             if ( ptr == 0 )
             {
-                static int32_t counter;
+                static uint32_t counter;
                 if ( counter++ < 100 )
                     fprintf(stderr,"created illegal block, retry\n");
                 continue;