Actually this kind of bug or freeze occured from time to time during the past, before 3.4. was released.
However, in my turn, when I tabbed greg’s creature for detail information the picture of that creature stuck on the screen and didn’t disappear, even after tabbing outside the card’s area.. indeed, nothing else was possible to do except for opening the battlelog and in the end to quit the game unfortunately. When this happened in the past it was usually possible to try to match some gems close to the edge, but this wasn’t possible at all.
That’s it
Thanks for recognizing
//Edited title - Daiane