[GRASSLIST:1990] malloc error in NVIZ

Anyone ever see the following error when using NVIZ? (I tried posting to the NVIZ GRASS list, but there doesnt seem to be much traffic there.)

*** malloc[1432]: Deallocation of a pointer not malloced: 0x2ff2ec8;
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

Sometimes it prevents NVIZ from working (blank grey screen), other times not.

C.
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Christopher J. Fonnesbeck ( c h r i s @ f o n n e s b e c k . o r g )
Georgia Cooperative Fish & Wildlife Research Unit, University of Georgia