I've been having this problem for a long long time now. Its survived through multiple versions of Viewer 2, a system reformat and an OS upgrade. But what takes the cake is with the latest version of Viewer 2, Linden Labs have removed the "open in browser" button! Now I can't view profiles at all unless I manually type the URL into Safari. Grrrr!
Here's a screenshot of the problem: http://cl.ly/8pf2