All of a sudden my Mail app is not working properly. When I click on the dock icon (or the app in the Application folder), I see the top menu bar but no windows open or will open. I have force quit and rebooted several times. I tried to rebuild the .plist file and rebooted my laptop but that is not working. So right now I have an open app with a blank desktop. If you could help me I would appreciate it very much.