I entered a hitball tournament at level 10, and was presented with a level 10 boss. I beat him and then nothing happened, and I got stuck. see http://cl.ly/image/2l3n001Z2Z2r
Having trouble reproducing this problem. A few quick questions:
(1) Did you have Patches the Teddy in your possession at any point?
(2) Did you have the Petrification XP bonus active when you killed your opponent?
(3) Do you ever restart your dungeon runs via the in-game menu?
(4) What was your overall game progress at this point? Were dungeon shops unlocked for you yet?