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Have you tried the steps in http://forums.comcast.com/t5/XfinityTV-Website/Troubleshooting-TV-Listings-Issues-Not-Loading-Incorr...
Is sounds like one of the filters may be selected.
It was back to what it should be and then it is wrong AGAIN....so it's nothig I'm doing!!!!!!! Take a look at "Your Guide to What's on TV" TV listing should be Ch 4, 5, 6, 7 13 etc But its startig at 49 !!~!!!!!!!!!!
When it's not working, are you seeing mostly or all sports channels?