Thanks -- unfortunately it seems to be heap corruption. I can see where
it's detected:

          ntdll.dll!RtlpLogHeapFailure () Unknown
  ntdll.dll!RtlFreeHeap() Unknown
  ucrtbase.dll!_free_base() Unknown
  _cmd.cp36-win_amd64.pyd!VLAFree(void * ptr) Line 222 C++
  _cmd.cp36-win_amd64.pyd!CGOFreeImpl(CGO * I, short withVBOs) Line 447 C++
  _cmd.cp36-win_amd64.pyd!CGOFree(CGO * & I) Line 435 C++
  _cmd.cp36-win_amd64.pyd!OrthoInvalidateDoDraw(_PyMOLGlobals * G) Line 2808
C++
  _cmd.cp36-win_amd64.pyd!OrthoAddOutput(_PyMOLGlobals * G, const char *
str) Line 1175 C++
  _cmd.cp36-win_amd64.pyd!PCatchWrite(_object * self, _object * args) Line
2738 C++

But that doesn't really tell me anything about where the actual heap
corruption happened.

On Wed, May 9, 2018 at 1:54 PM, Christoph Gohlke <cgoh...@uci.edu> wrote:

> I put a VS2015 build of svn rev 4189 including debug information files for
> the pymol source at <https://www.lfd.uci.edu/~gohl
> ke/download/pymol-svn-4189.zip>
>
> Hope this helps.
>
> Christoph
>
>
> On 5/9/2018 7:34 AM, Gary Oberbrunner wrote:
>
>> Hi; I'm running into a crash in Windows pymol, in the C extension part
>> (_cmd.cp36-win_amd64.pyd) using pymol open source 2.1.0. I'd like to debug
>> it; is there a symbol file (.pdb) available anywhere? Or failing that, can
>> I rebuild the C extension from source and create a pdb?
>>
>> --
>> Gary Oberbrunner
>>
>
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