Both versions have been rock solid for me- but I've also disabled gl extensions because I'm using Intel "Graphics". I think a lot of alt-tab errors are due to graphics, but I'm basing that on nothing solid, just a hunch. Resolution changes? Is your game set to your same res. as the desktop?
As an experiment, does it still crash if you create a shortcut to the game's exe
Code:
"C:\whatever Location\Dom3 folder\dom3.exe" --noglext
There'd be a way to fix it other than disabling it, but if this did/did not work, it would tell me something.