A couple of things I've recently noticed.
1. I have an image view scheme of People (grouped)/People. It used to be, in MC11, that if I selected 'A' from the People grouping, that the next pane would show me only the list of people whose names started with 'A'. Now, the list I get has all sorts of names in it. I'm not sure how this list is constructed, but one theory I had was that it's showing me the list of people whose names start with 'A', and all of the names of people who also appear in pictures with people whose names start with 'A'. Is that assumption correct? Or is it a bug? Either way, it's completely broken this part of MC. I can no longer easily whittle away my list of pictures to find one of a certain person.
2. IIRC, there used to be a "Search" function in Theater View, where you could build the name of what you were looking for, letter by letter. This appears to be gone now. What was the reason for its removal? Or am I just blind and it's still there?