I have been working with this extended profile on a local installation before taking it live.
Everything has worked just fine for me, using CB 1.2 RC2, and Joomla 1.5.3.
My only issue has been the replacement-tags, which are mostly useful with this extended profile. The tab which the delimiter field with the replacement tags is appearing in a tab in the Update My Profile screen, the tab is empty apart from the title for the delimiter field.
But I don't think this is an issue with the Extended Profile. I still can't fix it though