TiVo Bug?

I'm not sure if this is a bug or not, but wanted to see if anyone else has experienced this. I've noticed that my other networked TiVo unit disappears from my "Now Playing" list. It's happened twice since I've had 2 TiVo units networked. I'm wondering if it has anything to do with service updates from TiVo since there was a new update on my TiVo when I returned from vacation - the new search feature. I haven't looked into the problem since I don't normally use the transfer option, but last night I noticed my other TiVo unit was not showing up in the list. I'm going to check into it further tonight if I get a chance. Anyone else having this issue?