better fix

src/miner.cpp

@@ -222,10 +222,13 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
     boost::optional<CTransaction> cheatSpend;
 
     uint256 cbHash;
-
+    
+    boost::this_thread::interruption_point(); // exit thread before entering locks. 
+    
     CBlockIndex* pindexPrev = 0;
     {
-        boost::this_thread::interruption_point(); // exit thread before entering locks. 
+        // this should stop create block ever exiting until it has returned something. 
+        boost::this_thread::disable_interruption();
         ENTER_CRITICAL_SECTION(cs_main);
         ENTER_CRITICAL_SECTION(mempool.cs);
         pindexPrev = chainActive.LastTip();