iPad iOS 4.3 Home Sharing with multiple iTunes libraries

I have 2 iTunes libraries on one Mac Pro and one Mac Mini. The libaries are available on the same home sharing network and all good there. All passwords are correctly entered into my computers and iPad.Both are recognized by my Apple TV 2, however, my iPad 2 can see the iTunes library on each of them, but not both at the same time. Only the Mac Pro library shows up in Shared libraries, when