Hello;
I'm using the Desura version, with Win7 64 bits. I have been unable to play the game more than 15minutes without a crash.
I experience also the layer issue with covers and some stuff.
I had the invisible alien that made me CTD everytime i try to kill him
I had the CTD when I sent my Chinhook on 2 missions in a row without returning to base
I had the freeze at Hidden movement
I had the freeze on loading a save that starts on the Geoscape.
I know it's not released yet, but the build is very far from stable IMHO. It's unplayable.