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The GoG version got the same issues the box version had (to me) when i try to run the game on Win7 i got dozens of graphical bugs, no walls or characters are visible.
Turn Vsync off. That fixed the problem on the Boxed version for me. So maybe it will fix it on the GOG version too.
https://www.gog.com/forum/the_suffering_series/the_suffering_series_aio_unofficial_patch/page1