I have no idea if this is a new change in DV or a bug, but it is annoying the heck out of me.
My ruler's grandson (and thus 2nd in line to the throne) is the Duke of Brittany. He was excommunicated by the King of Sweden. So, I went crusading, racked up a bunch of piety, and when the Pope died, a bishop friend of my ruler got the Papal spot. I became Papal Controller. Problem is...I cannot revoke the excommunication on my ruler's grandson. If I select the option, and select him, no button comes up to revoke excommunication. It's not like it is even greyed out - it is just not there at all. All there is is a back button, which obviously doesn't do it.