I had this issue when importing my project to a new PC. When I opened the designer sometimes Custom props would be gone, and sometimes the title menu would be gone. I had to re-open the designer multiple times without saving in order to get a 'good load' then saved, and the problem hasn't seemed to come back. Unfortunately, I originally made a save prior to realizing that issue was occurring, and it messed things up royally, making me have to restore back up again. If anything, this taught me the automatic backups from ignition is a great tool to have in place in the event of any issues, I also now am in the habit of verifying when I load designer the Session props and the page configuration load appropriately prior to making/saving and changes. Never ran into this problem until I restored for the first time, however.