It keeps on crashing Mail. I get the "Mail Unexpectedly Quit" message although Mail stays up. Trying to Quit mail hangs mail. Force quitting Mail and then relaunching will then show the "unregistered" MailTags dialog. Must register the software again. This happens just about every week now and some times several times a day. Worst part, it looses all the settings including the projects, keywords etc. Frustrating.