I was running Mainstage 3.5.0 on an R7 Ryzentosh without any issues, and I had it running on a Macbook Air, though it was starting to struggle with the 5GB file. I decided I would buy a Macbook Pro M1, and thought this would last for years, however, every time I load my file (and the last few saves, it gives an error - MainStage 3(13583,0x10499bd40) malloc: *** error for object 0x130b94310: pointer being freed was not allocated
I posted it on the Mainstage Forumhttps://discussions.apple.com/thread/252935060, but no luck.
I downloaded 3.4.4 which worked, however it would say it couldn't find DeEsser 2, and it was taking longer than expected to load, and would sometimes hang.
I did a complete Erase, and reload of the system, and started with the basics. I downloaded the latest version from Apple MAc Store. When I enabled the Hammond Organ and 2 other synth plugins, the file would crash. I tried taking out the plugins, and eventually I have it running with an older version of my file, however it says the Hammond organ has failed validation (yet the plugin still seems to work.
Looks like I have lost 3 months worth of work on about 30+ songs. The Hammond version is 1.3.3 so all should be fine version wise.