Sounds like the browser request is not being passed through by MDS. I don't know the solution, but I would start by looking at your MDS environment.
[red]"... isn't sanity really just a one trick pony anyway?! I mean, all you get is one trick, rational thinking, but when you are good and crazy, oooh, oooh, oooh, the sky is the limit!" - The Tick[/red]