A bug or is it just me?

I am a newbie with TIVO. I did search for this issue and didn't find anything, so be kind if this has been asked before.

I was enjoying some photos and music that I streamed from my Vista computers to my TIVO over my wireless network. When I was done with that, I tried to play a program that TIVO had recorded for me. The TIVO Central button took me where it should (though with a blank grey background), but the Now Playing button did nothing and Watch Live TV also did nothing. I restarted TIVO and was able to watch the recorded program. Is this the result of something I did, or is there some issue moving from media streaming back to TIVO's main functions?