I have run across an issue where immediately after a combat ended, I re-entered turn based (as 2 characters were down and the real-time death saving throws are impossible to beat), I helped both characters, but now can not exit turn-based again. Attempting to exit by either clicking the button, or pressing shift-enter simply "ends the round", and remains in turn-based. I tried running all characters away from the combat location for 4 "rounds" but still cannot exit.
Saved and exited the game, didn't fix it. Transported back to camp, didn't fix it. Luckily, Wyll had a conversation, so I spoke to him (After 2 turns of movement to reach him....) and when I exited the conversation, turn-based had also ended.
Very frustrating, but thankful that I don't have to reload an entire (difficult) fight.