EX-710 TV Guide (TVGOS) works again.
Thought I'd share a solution to my EX-710 TVGOS problems: A factory reset.
My TV is setup with a rooftop antenna for OTA. TVGOS has always been a bit flaky, but when I got back from vacation, had stopped working altogether. I confirmed my local NorCal CBS station was broadcasting the TVGOS feed. I tried to reset TVGOS several times. No luck. So I e-mailed Rovi customer support. It took a week for them to reply, but they said to try a factory reset of the TV.
I wrote down all my picture settings, then held down the remote up arrow button while pressing the power button on the side of the TV for about 5 seconds as I held my breath. When I turned the TV back on, I had to do the TV setup as if I had just bought a new TV, then scan for channels, etc. Then I went to the TVGOS menu and ran through the setup menu there. Left the TV off overnight, and PRESTO! I had TVGOS for the 1st time in months when I turned it on this morning. Hope this helps others.