When I beat Heinous Hordes 7 (3 stars) it goes to the "calculating rewards" screen and never proceeds. I've tried 3 times, beat it with 3 stars all 3 times, and the same thing happened. If I click "return" it goes back to the main screen and the level is not cleared (0 stars). I exited out of CoL2 after the 2nd time and then re-opened the game for the 3rd try and same result.

Any advice/suggestions?

Solved: I hadn't updated to the version yet. Updated and the problem is fixed.