OK Guys, I dont normally reply to strings like this but this was bugging me because I was having the issue too. In a former life I was a tech dude so I feel pretty sad for the Comcast tech because I know it's not his fault some Dev probably snuck in some code and QA didnt pick up the regression ...but basically I think the issue is that, that js file https://tv.xfinity.com/elements.js was likely updated. If your solution (your page) is calling for a reference to that it has loaded before (like a js file), most modern day browsers (This includes Chrome and IE) will try to retain cached copies of it for faster load times and less impact to the back end server (Client side coding) .
In your in chrome settings delete your history (Either "From the beginning of time" or From when you last remember the xfinity tv page working) youll then want to
kill any running sessions of chrome in your task manager - I always
use the "Processes" tab in task manager then
sort alphabetically, look for any chrome.exe processes and end task -
Restart Chrome, (sorry mac guys no clue what that is on a mac) when you do that, at least for me anyway, then '
navigate to https://tv.xfinity.com
it should ask you to log in again and register your PC.as if you had never been there before and becasue of this your browser should redownload any dependant scripts or styles it needs for this page that should probably migrate to HTLM 5
I had this issue before with one of my sites I manage
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