Intermittent Matplotlib crash on OS X

Hi all,

Matplotlib occasionally crashes Python at the end of a long program on my powerbook g4 running OS X 10.4. gdb output follows:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0a68fe40
0x002eae50 in visit_decref (op=0x28a1cb0, data=0x0) at /Users/ronald/Python/r25/Modules/gcmodule.c:270
270 /Users/ronald/Python/r25/Modules/gcmodule.c: No such file or directory.
        in /Users/ronald/Python/r25/Modules/gcmodule.c

or

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000056
0x002eae50 in visit_decref (op=0x28a17e0, data=0x0) at /Users/ronald/Python/r25/Modules/gcmodule.c:270
270 in /Users/ronald/Python/r25/Modules/gcmodule.c

It's always something like that, and it always happens after the little Python icon starts bouncing around in the dock. I don't know anyone named Ronald and no such directory exists on my machine.

Thanks,
Anand Patil