Wanted to try the new Eternal League "campaign" and went with the "Afterlife" mixed race team. Played my first match vs Goblins.
When I tried to take a screenshot during the opponent's turn hitting F12 (Steam overlay screenshot system), the game timer froze and the client stopped playing any sound. Animations were still playing but apart from that the match was frozen.
No option to "unpause" or save the match:
Attempting to quit the game via the UI didn't work. Panel disappeared and back to the frozen match.
Attempting to concede the match crashed the client:
Full Imgur album: https://imgur.com/a/w6xhr