Hi!
I had the same problem, but managed to solve it somehow. I had the new profile page, wanted to add another banner, but upon clicking the edit icon, the 'About' section was empty. Then I switched to the old profile page, did the same, and the About was still empty. Then I switched back again to the new profile, clicked the edit and the html's are miracoulously there in the About section.
Let's hope this is a solution for you too.
ktikat