Hello Ranier, In previous messages you have pointed to some memory problems. https://sourceforge.net/p/iup/mailman/message/36053676/ https://sourceforge.net/p/iup/mailman/message/36053696/ Let's take the discussion off the localization thread and discuss them in a separate thread. That's hard to say what could be a problem by just looking at the callstack. It would be best if you could boil down the issue to a simple test code that would replicate the errors. Or at least try to describe your test case. Also, I don't use Windows, so I won't probably be able to help if the problem is specific to MS Windows only. Best regards, blueowl
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