Photos keep disappearing from 'Computers' menu

Anybody else have issues with the new Photos and Home Sharing? I know how to tell iTunes to use the Photos library (as opposed to Aperture or iPhoto) and it works fine, for a while. Then photos disappear from the Computers menu, until I switch libraries in iTunes to something else and back. All my other stuff (TV, Movies, Music etc.) works fine. Help appreciated.

I'm surprised, given that the photos are now cloud based, that there isn't a Photos App.