Testing on Win 2K SP4 w/ IE6 and Win XP SP2 w/ IE7, I never see a 'server busy' message and get the same results with UR as IE standalone -- the slideshow page opens in a second/external, full-screen IE window. It's not a normal link but insists on opening in a separate window without menus, toolbars, etc., so it seems to be working as designed. Just speculating, but maybe if the external IE instance takes a while to start/initialize, Windows could report a 'server busy' message during that time.
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