On my site I've activated the Profile module and added new user fields (phone and city) under a category called "Contact Info."
If I'm using the Garland theme (or others) and I go to edit a user, I see tabs that correspond to the categories--the default category of "Account" and the "Contact Info" category that I created. So far so good.
If I switch to Bluemasters and edit a user, I see all the "Account" fields, but I no longer have access to the fields in the category "Contact Info." The tab that should take me to "Contact Info" isn't there.