LetoX
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Personally, before I understood why I couldn't see the map files in the script editor, I used a regular editor. I would go to the map properties, find the "mapscript" section, and work there before clicking OK. Then, I would copy the entire script. If it didn't crash (most of the time it worked fine), I would close the editor to save, and if it did crash, I would use Ctrl+V.