TV Guide will not update
The problem is not with your machine. TVGOS information is embeded in part of the a PBS analog signal. With the covnversion to digital, some PBS stations are not sending this data out anymore. Also, some cable companies are not converting the digital signals to be sent out on the old 125 analog channels.
If you try to chase this down with the Cable Companies or PBS techs, you will get; blank stares, help desk happy voices, it's not our problem, we don't support TVGOS, etc.
Personally, I think that the digital transition has killed TVGOS. It ain't comin bak, no more, no more.
Start looking for a replacement DVR that is easy to program.
No, wait, try to find one! Blue Ray along with Cable Company & Dish Network, etc. DVR's have killed the market for a stand-alone DVR's.
But there s always TIVO $$$