I'm not too sure if anyone has posted this bug, but here it is anyway.

Midway through playing I noticed that the unit cards, exit buttons and notifications all had very strange overlays on them. Mainly parts of the unit cards and the unit description image (the bigger one). Sorry if I am unclear, it is a little hard to explain. It didn't cause a problem initially but upon exiting the campaign it crashed the game.

Just notifying you guys, it doesn't seem too serious. I'm not yet sure if the game will crash upon re-entering the campaign.