They recently changed providers from Zap2It to Rovi. You'll need to setup your listings again as the name has likely changed.
Yeah... there's reasons I dumped Media Center for NextPVR.. MC has always sucked at grabbing listings.
I have used WMC for 5+ years without issues (other than hacking it to get HD working in Canada).
I don't want to end up paying ongoing fees for guide information, so the third party solutions are out for me.
There's other free solutions out there for listings (mc2xml, zap2xml) schedules direct was just the one I went with given it involved the least amount of effort.
That is why I stuck with WMC. Least amount of effort and free. Some script to scrape a web page is always going to run into issues, when they change the web page. Zap has no interest in making scraping easy.
I now have the guide cutover working with WMC, just one channel missing. Probably good for another 5 years until they stop supporting Win7.
Anyone know where to get MC if you accidentally uninstalled it? It's no longer available for download from Microsoft