If you find your game either becomes stuck or crashes when attempting to Alt-Tab/Minimising to Desktop out of the game, please try the following:
Reinstall your graphics card drivers:
If this still doesn't resolve your issue, we'd recommend going into your in-game preferences and changing your display from 'Full Screen' to 'Windowed' mode.
If this still doesn't work, we'd suggest making sure Steam overlay is disabled. Details below:
Turning off Steam Overlay:
Go to Steam -> Settings. Click the In-Game tab. Make sure "Enable Steam Overlay while in-game" is un-checked.