I found out how to fix on my Chrome: removed the bookmark of the comcast email. Then restart Chrome type "Comcast Email login" fon Google Search. Then book mark the new link. Somehow the old Comcast link corrupted. With the new link it works fine.
EXCELLENT! Contacted Comcast, and Google, searched online they had no clue what was going on for about 10 days now until your fix solved my issue. Thank You!