Until the last version upgrade, I would have given Clemenza five stars. It was indeed a simple, intuitive editor, and one that I have been using daily. The last version upgrade doesn't add anything that I needed, and now it seems that I can no longer access documents that had been created with the earlier version. I see now that there is a notice on the upgrade that states, "This version doesn't match last version…" Unfortunately, like many others, I think, when I go into the App Store upgrade area, I choose to upgrade all and don't read these details.It's not a catastrophe, since I didn't have anything hugely important in Clemenza files, but most app designers make upgrades compatible with work created in earlier versions, particularly when the upgrade is a minor upgrade, within the same version number. I won't be using Clemenza again, because it's too much trouble when each minor upgrade within a version renders work done on earlier versions inaccessible.