[OSX] Updated to Calibre 2.73 and am now stuck

I updated yesterday and today cannot Save to Disk. When I try to drag a book to Save to Disk, it just doesn't save. Then i tried to Connect/Share--which shows my previously Saved books in my Dropbox. But now I cannot seem to Unconnect On MacBook Pro running Sierra... Really stuck and with lots of new books to add Grateful fro Guidance!