Did you change the way you calculate the playlists when in Theater View?
I have several top-level playlistgroups which have a lot of playlists inside.
Now, when i select playlists in Theater view and i try to switch between the playlistgroups
it takes up to 10 sec for the cursor to switch. Looks like you are doing some calculations
for the underlying playlists.
This started with the new build i think.
There was a discussion related to the topic:
http://yabb.jriver.com/interact/index.php?topic=40590.msg276677#msg276677