|I just got off the phone with Comcast, and after trying EVERYTHING mentioned on various sites, all the rep had me do was to clear my browsing history.|
Settings > History > Clear Browsing Data
When you do it, leave "Passwords" and "Autofill Form Data" UNchecked, and change the top drop-down list to "Beginning of Time".
That's all I needed to do, and it worked right away.
Hope it helps!