just reporting a massive cdt issue on win vista 32, basically the game crashes every 5-10 mins without specific reasons, tried disabling / enabling video options etc but got same issue, also it doesnt keep saved customized controls (even if saved, exit, return in game before a crash).
It crashes also "on demand" if clicking the objective button.
So well just reporting as i saw different posts about compatibility issues on win7 but it seems the same happens on vista too.
Hope gog will fix it in some manner or explain a workaround at least, atm the game is unplayable.

Running on:
Intel E8500 (dual core duo 3.2)
3 gb ram
ATI 5770 1gb
win vista 32

Did you try lowering the resolution to 800x600? Had similar problems on ATI GPUs before I did this. Now it seems to be working fine.

I can confirm that in 800x600 i was able to play a full mission (i think it was number 4) without crash. Before on 1024x768 i couldn't play for 5 minutes straight, too. Don't know if i was just lucky this time or if it really helps in the long term, though. Will see today when i've time to play some more.

Your advice is valuable, in 800x600 it still crashes, but it seems playable, atm i see i have a crash more or less every 2 hours, to be tested more ofc, anyway can be considered annoying but if it stays on this average the game is playable.
Sorry if i didnt open the post as a help request.