Thank you. That showed the problem exactly. (I do hate Data File Host. Chrome downloaded a 0 byte file, but Opera downloaded the file correctly.)
Unfortunately, I still really can't duplicate the problem. I am also on Win 7 x64 (Ultimate), and I tried the exact steps you used with the exact same versions of the the exact same three browsers you used, all with no problems. FWIW, Firefox was the quickest in its page loading. I tried multiple times with each browser. I MIGHT have had a very slight hang one time with Chrome. The "Loading" did not stay visible, but the page was kind of grayed out. Refreshing the page made everything OK, and I could not make it happen again, trying many, many pages on the site. There was never the slightest hiccup with either IE or Firefox. Sorry. I'm afraid I don't know what's causing your problem.
Cheers and Regards