Crash when loading unit restrictions

[IMSabbel]

I could reproduce a spring crash when loading or saving a unit selection, and then clicking on the minimap (as to view startpositions) in the Tasclient.
It resulted sometimes in a division by zero error, but most of the time in a "cant find mapname.smt (i think)", followed by a generic errorbox.

When trying to start a game after loading unit restriction settings, it resulted in an errorbox "cant find xxxx.lua" (yes/no), with a crash on selecting any option.

Just as a test, i set exactly the same unit restriction settings per hand, and it worked perfectly.