I'm developing on a machine with windows xp sp3 and visual studio 2008.
When I try to switch from source to design mode or split mode for an .aspx file the tab showing the file freezes. No matter how long I wait it never shows the design mode. The only thing I can do is close the tab.
Recently, I've installed VS 2008 SP1, Silverlight 3.0, Team System and Microsoft Expression suite. So it's possible that one of these installations have caused the problem. I've also installed patches for vs2008 but it didn't help.