Yahoo says I'm signed into another computer

Hi all -
I have my Tivo Series 2 setup to login to my Yahoo Account (for weather, traffic, photos, etc.) Up until this week, I almost never logged into that Yahoo account from anywhere else.

Recently I installed Yahoo Messenger on my PC at the office. I tried logging in with the same account, but I get a message "Sign-out Notice: YOu have been signed out because you have logged in from a different computer or device".

I am wondering if the Tivo logging into my Yahoo account is causing this. Has anyone else run into this? I'm using Yahoo Messenger with Voice 7.5. I've also tried this with Yahoo Messenger v 8.x (whatever the latest version is) and it didn't work either.

Thanks,