Scrivener will not launch

Yesterday Scrivener was working well. Today, after restarting my Mac, Scrivener stops responding during the start up process.

In other words, I try to start Scrivener. Before the window appears, it hangs, and all I can do is force-quit the application.

Does the software start up fine if you launch it from the application icon (not double-clicking on a project) with the Shift key held down? This will keep it from automatically loading any projects, so it keeps things very simple. Next, try making a new blank project somewhere temporary as a test and see if that works.