What you were expecting to happen, and what actually happened?
Had some Revenges built up from the night before, played one as per normal, won obviously, then when I went in to Revenge a second time, the kingdom emblem became super imposed, and can cause an endless load-loop if you either;
A: Click the ‘Defend’ button.
or B: Exit out, and try to reenter the Revenge section.
What are the steps to make it happen again?
Have at least 2 Revenges stocked up, play one, attempt to play a second one.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!