I've just had a minor glitch, could have been bigger, with the save data on exit feature.
I have 4.3.3 currently installed on my main computer but am running 4.3.1 on one of my MacBooks. They all share a common library housed on my dropbox drive. When I launched 4.3.1 on the MacBook, I got an error message about incompatible files, loading a backup etc. Once the (very old) backup had loaded I realized what the issue was and tried to check for updates but the option was greyed out. Closed the program and watched the "saving data" come and go and realized I'd just overwritten any recent work I'd done on the main computer. This was indeed the case.
Would it be possible to have an "exit without saving" popup appear at application close instead of automatically saving all data? At least until we have a release that doesn't use a proprietary file that isn't compatible with previous releases.