The following code will trigger Application Verifier on Windows 7 RC: //Compiled with VC9, run under Application Verifier 4.0.0665 void * buf = malloc(4096 * 16); assert(buf); buf = _expand(buf, 2 * 16); assert(buf); _expand(buf, 4096 * 16); // "Heap block corrupted after being freed. " This makes App Verifier next to useless, since it is randomly triggering things in my application which aren't actually my problem. I would like to know where exactly the problem lies. Thanks

Application Verifier is a development tool, so it would be best if you posted your question on the MSDN Developer forums. -Nick