you can try clicking the "reset window layout" under the window menu (either at design time, or while its running and you see your issue.)

If that doesn't work, then I would try running devenv.exe (the IDE) from the run command in the startmenu, with the following switches:

devenv.exe /resetsettings (try this one first)
devenv.exe /resetskippkgs

Also make sure you are running SP1