garageCube

I downloaded the MM5 while upgrading to the MacBook Monterey ios this time. I set up all the scenes for the performance and tried to save the file. While I pressed the save button, suddenly it crashed, and all the scenes were disappeared. And It is kept showing 'Project file is incomplete.' It makes me mad!!! I do not understand the problem and how I can fix it. :'( Does it any issue using MM5 at Monterey? Shouldn't I upgrade MM5 or Monterey? Should I have to downgrade the ios? My computer spec is MacBook Pro, GHz intel Core i9, 16GB 2400 MHz DDR4

No you shouldn't downgrade anything. I'm not aware of an issue that could make the application crash while saving. Did you send a crash report ? If so, did you set a email or do you know at which time you sent the report ? We can investigate.