I'd like to add to this thread as I'm having a similar problem. I played through and won Swamp Romp and unlocked the Plant god (blanking on the name). The tally/score screen went fine but the game froze after that (a black screen just saying 'loading') and I eventually had to force quit the program.
Now the quest is marked as completed, but I did not receive the gold and I don't believe the the new dungeon reward either (I had completed Swamp Romp with the required two classes). Also, the new plant god is not in my book, though the God section has a 'New' sticker on it (that won't go away). There are just a couple blank pages there.
Can I send you my save game? Can you revert or fix this wonky cloud status?
Also, I just want to add - thank you for this fantastic game. It is a gem.