Noticed while playing today once I reached area 6 occasionally when clicking on a battle the screen would go black. Backing out to main menu and continuing seemed to fix it. Once I got to area 8 though it kept happening no matter what. Love the game, it's been a lot of fun.
Thanks for letting me know! Any more info you can give e.g the class you were playing and what abilities you had would be super helpful. No worries if not though, I'll be looking in to it :) Thanks for playing!