I broke it too. Used a wild shape, then all the shapes were still outlined in blue, prompting me to place another. Tried to place one and then cancel, and that seemed to clear it up, but then I clicked on an unused die and it locked up but good.
It seems to be stemming from the Cancel button and not every time. I've not yet seen it lock the game up - clicking the other dice or another shape usually cleans it up. I'll figure it out...
