I heard from this problem before, could you look up your "S.T.A.L.K.E.R. Clear Sky\_appdata_\logs\xray_USERNAME.log" but I'm sure its the "n a_guitar" Error.
The most easy fix is to load a savegame instead of starting a new game. I'll upload a new version including a savegame as fast as possible.
Grasyl
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