Had the same thing happen to me today, playing Historic Izzet Affinity against a Feather deck. Never had it happen before. Escape did nothing, couldn't play cards or enter the options menu; things like viewing graveyards/libraries were still possible though. If it's relevant at all they seem to have conceded at the same time I went to activate Karn? Attached a log as well; it might be useless since I had to force close and reopen the program, but might as well.
Had the same thing happen to me today, playing Historic Izzet Affinity against a Feather deck. Never had it happen before. Escape did nothing, couldn't play cards or enter the options menu; things like viewing graveyards/libraries were still possible though. If it's relevant at all they seem to have conceded at the same time I went to activate Karn? Attached a log as well; it might be useless since I had to force close and reopen the program, but might as well.