Were you using the 7290's supplied browser or specifically the BlackBerry "Internet Browser"? The icon looks like a globe with little colored "push-pin looking" people around it. I had the same issue w/ browsing non-WAP sites when using the supplied mMode browser from AT&T.
I simply called AT&T BB support and asked them to enable the Internet Browser for me and that solved the "more" problem. The icon for Internet Browser popped-up seconds later and I was in (slow-motion) browsing heaven!
Now I have an issue w/ SSL sites, but that's a different story.