A few questions:

You might try to run Geany from command prompt[0], passing the -v option, which will make it write out debug messages to the command prompt. I'm guessing the messages will contain a bunch of warnings/error messages leading up to the abort/unhandled exception. If so, and you could paste the output here, that would be really useful to troubleshoot the issue.

[0]: from Command Prompt window, type similar to:

    C:\> C:\Program Files (x86)\Geany\bin\Geany.exe -v


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