Xfinity Forum Archive...
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Post your questions in the Xfinity Community
Without knowing what you have or have not tried so far, here are some suggestions to start with-------------------
Try clearing out your browser's cache/browsing history. When you have done that, close out the browser and re-start it in a fresh session.
If that doesn't do it, then try using a different browser and see if you can duplicate the problem that way. If it works OK then you will know the problem probably lies with the first browser. eg: if you are using Internet Explorer, try Chrome or Firefox.
Also, you could try switching from the Full version of Xfinity Connect to the Lite version. Go to Preferences>>>>General, and see which one you're using now. Full is the default. Select the Lite version.
As a temporary work-around, you could try using the very basic m.comcast.net/m---just type that into your address bar while signed in to the account, and hit return.
If you are using IE 10 or 11, make sure Compatibility mode is enabled for comcast.net. You will find it in IE under "Tools". If you are having the problem in Chrome, try resetting it to it's defaults.