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In a big model, the program crashes when you try to run any Python-script or add-In.

Visum 11.5 is affected by an error in the memory management of the component wxPython that may cause an crash for really big version files (> 1 GB). In Visum 12, this is corrected with a new version of wxPython. Workaround:
1) Start Visum.
2) Run any add-In (i.e. Python console) and close it again.
3) Load the version file.
4) Run the add-In's.