First, I wrote a detailed description here and clicked post. The login screen came on. I signed in and now my message is deleted. Here we go again. I rebuilt and verified the desktop: thanks for the idea. Then more trouble began. I doubleclicked the backup icon to remount it, but it doesn't seem to do so, as I click open company and am given only one option that is not greyed out: the windows backup. I cancel that and click open recent company. Then a backup immediately begins. If I don't interrupt it, I get another login window despite being logged in. I have to select open company or recent company and the process repeats. I've tried this over and over, including rebooting, with the same result.  I am so exasperated. Any ideas?