Happened again. This time I was ready and took screen caps. I have been wondering for the past few days why I have had so little gold (less than ever before in the game). Now I know.
Until I see that this bug is fixed this game loses its appeal. I'm forever losing the gold won for badges/class use yet I still need that gold to complete the next stages of the game.
Before adventuring:
Dungeon beat:
After Adventuring