Xcode Hangs at Startup Xcode fails to open on my machine - OS X 10.8.2. It opens the main screen and just hangs there with the spinner spinning becoming unresponsive. If I double click a project, it just hangs sating it is loading.
I tried:

Uninstalling and re-installing;
Removing my project tree;
Deleting some recommended preferences, most of which did not actually exist on my machine to begin with.

Things of note:

This is a new computer. The first time I ran Xcode, it opened fine, though I didn't try using it. The problem appeared when I first opened an existing project.
I created a new user on the machine. When that user is logged on Xcode loads successfully. Apparently it is a user settings issue.
Removing the ~/Library/Saved Application State/com.apple.dt.Xcode.savedState/directory might help as well.