Can't access Comcast "Bookmarks"

I've managed to switch my MSN.com Favorites to IE - they should have been the same on both browsers, but IE was missing quite a few - and have turned my attention to Comcast's Home page.

At first I was able to access the list, and enter a few items; however after the first four or five it was no go. Everything looked ok, but when I went to check the list subsequent items had disappeared.

Any ideas?