Affected Platform: Steam
My Kuro Shobi is just about to level. Collecting her quest is not enough XP, but I hit the x2 XP reward. This pushed her to level, but the game's frozen.
Might be specific to her going from 54 to 55 (her max level)
Steps to reproduce:
1. Be about to level a hero, not quite enough from collecting a quest, but close enough where double will do it.
2. Collect that quest.
Solution: Invest a couple times in her building to manually force the level, then collect the quest. This isn't viable for Lorelei or Professor Charles though.