Hate to be That Guy but here goes
I jailbroke my KT3 today, installed the appropriate hotfix, MrPI, and KUAL, checked that KUAL was working (opened, seemed fine) and then went through the
[HOME] -> [MENU] > Settings -> [MENU] > Update Your Kindle dance to get the latest firmware but I think that was a mistake, because now KUAL isn't working (Application Error).
Any ideas on how to fix?