Sometimes something like the following will come up: *** malloc[438]:
Deallocation of a pointer not malloced: 0xffffffff; 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 it seems to be
a bug in Apple's OS X Java. It doesn't appear to hurt anything but there
doesn't appear to be anything we can do to fix it.

original report:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=SoftwareBugs;action=display;num=1119522959

If there's an OS X Java guru out there, some input would be helpful... A
google search at the time of this writing didn't turn up anything useful.