This could be misinformation, but some of the boost libraries have
compile time flags that depend on whether or not threading is enabled.
As an example, I was running into issues with an invalid free() with
respect to shared_ptr (in the cctbx project). Unfortunately, (for your
case) the fix was to download a more recent version of the cctbx project
that no longer exhibited this problem.
In short, the boost smart pointers, boost spirit, etc. implementations
vary depending on the compile time options. I don't know if
boost.python has options.
Also, I found that with these issues it is generally easier to pinpoint
the problem when the code is compile without optimization.
--Jeff
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