Problems with tk85.dll when shutting down an application that embeds the Python interpreter.

Question

My C++ application embeds the Python interpreter, but seems to be having some trouble when it shuts down. Right after the main window closes, I get a segmentation fault (this is Windows, but we'll call it a segmentation fault anyway). The stack trace is below:

#0 102AD580 tk85!Tk_MainWindow() (C:\Users\... 1.3\bin\Debug\lib\tk85.dll:??)
#1 103082DD tk85!XSetStipple() (C:\Users\... 1.3\bin\Debug\lib\tk85.dll:??)
#2 102214A3 ??() (C:\Users\...1.3\bin\Debug\lib\tk85.dll:??)
#3 10220000 ??() (??:??)
#4 00000000 ??() (??:??)

Where would I even begin to debug this problem? It seems to be reproducible.