I'm seeing the following valgrind warning in three out of eight runs under heavy load: InvalidRead IMM_FreeThreadData:233 DllMain:382 __wine_spec_dll_entry:40 MODULE_InitDLL:911 LdrShutdownThread:2174 call_thread_func:403 start_thread:444 It kind of feels like a race between thread shutdown and process shutdown. Does that ring a bell with anyone? - Dan