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To anyone who's wondering..
There seems to be a glitch in the current version of Google Chrome, at least for Windows 7, when trying to watch TV on tv.xfinity.com from XFinity's X1 setup when you have the toolbar for the free downloadable version of Norton that comes with XFinity. I've tried watching, specifically channel 4 (ABC) just now, and all I get is the sound if I have the Norton Toolbar active. But if, when I sign in to the tv.xfinity.com website, I hide the Norton Toolbar (by hitting the caret/up-arrow on the far left of the toolbar), the broadcast shows just fine with both sound *and* picture.
There was only one update missing, and it was likely a very new one, as my Norton program set updates regularly on its own. My TV watching over the Internet is still the same. If I hide the Norton Toolbar, I can watch TV from the tv.xfinity.com website just fine; but if I have the Norton Toolbar active, only the sound comes through. This error doesn't happen when watching On Demand movies, only live TV.
Could you please try uninstalling and reinstalling chrome and then try again Also let me know the version of chrome if it does not work after the reinstall.
If you are logged into you google account, the history is saved to your account and will not be deleted if you uninstall. You can find instructions to backup the saved passwords here https://productforums.google.com/forum/#!topic/chrome/bxO4ai2JKLY