There's a fairly annoying bug in the new Front Row's shared music feature. (Someone please try this on their system and confirm.)
If you try to access a shared library that has already been accessed by five users today, the iTunes app will tell you that you can't use the library; only five different users are accepted each day to prevent widespread listening of other peoples' music. (iTunes' shared music feature is intended for use in individual peoples' homes among their own computers.)
But if you access the same library in Front Row, the spinning logo will just spin indefinitely, forever. Front Row doesn't realize it can't access the library, even though (when you force quit) iTunes has the dialog box saying it's inaccessible. When Front Row is in this state, force-quitting is the only option.
If you try to access a shared library that has already been accessed by five users today, the iTunes app will tell you that you can't use the library; only five different users are accepted each day to prevent widespread listening of other peoples' music. (iTunes' shared music feature is intended for use in individual peoples' homes among their own computers.)
But if you access the same library in Front Row, the spinning logo will just spin indefinitely, forever. Front Row doesn't realize it can't access the library, even though (when you force quit) iTunes has the dialog box saying it's inaccessible. When Front Row is in this state, force-quitting is the only option.