Yes! I finally made ChucK barf this up: mcchuck(23354,0x1825a00) malloc: *** Deallocation of a pointer not malloced: 0x603e7c; This could be a double free(), or free() called with the middle of an allocated block; Try setting environment variable MallocHelp to see tools to help debug [chuck](VM): internal sanity check failed in shredule() [chuck](VM): (shred shreduled while shreduled) mcchuck(23354,0x1825a00) malloc: *** Deallocation of a pointer not malloced: 0x603e7c; This could be a double free(), or free() called with the middle of an allocated block; Try setting environment variable MallocHelp to see tools to help debug [chuck](VM): internal sanity check failed in shredule() [chuck](VM): (shred shreduled while shreduled) mcchuck(23354,0x1825a00) malloc: *** Deallocation of a pointer not malloced: 0x603e7c; This could be a double free(), or free() called with the middle of an allocated block; Try setting environment variable MallocHelp to see tools to help debug [chuck](VM): internal sanity check failed in shredule() [chuck](VM): (shred shreduled while shreduled) Killed I had to kill the process in the end, which was spinning in an infinite loop of some sort. I have to admit, the code I'm running ALWAYS crashes, however, often just with the regular Mac OS X 10.4 catch-all, "bus error". Full disclosure, this is a custom build of chuck with one minor modification: the Object.typeOf() stub is filled out with code from the Object.toString() method slightly modified to just return the string version of the class of the object so that I can determine the type of objects in code. But I never use that in the code I'm running right now. The bus error is totally repeatable in regular ChucK 1.2.1.2, but it's going to be a while before I get as spectacular a display as this. ;-) Of course, then I turn up the output of the VM to --verbose10, it won't crash properly, however, it does skip occasionally and tell me: [chuck]:(9:FINEST): (via rtaudio): OS-X audio output overrun detected! Perhaps increasing the buffer size on the audio system would help? I'll see if I can't get a trace of it crashing again. Cheers, Mike -- http://michaelclemow.com http://semiotech.org