I personally use Celtx all the time for screenplays, but I have noticed two major problems with the current update of this app. First of all, it keeps asking me to login when I have already logged in before. Second, it fails to sync the edits I have made. When I bring up a recent edit that I had previously edited on the computer, it shows an older edit and the old edit replaces my newer edit. Why would I have to waste my time trying to get the screenplay back to the way it was? The sync issue is the biggest problem.