Big thanks to @woland for sorting out my issue with opening this file. 

The solution was to reset my Isadora preferences!

Just thought I'd share this info as it might be useful to others in a similar situation. From the menu bar: Isadora - Reset Preferences.

Thanks again to everyone that offered help - great community!

Simon

@dusx @vidasonik

This thread went pretty far afield from the actual problem, with many of the exchanges focused on OpenNI Tracker when the actual issue had nothing to do with that plugin. So, for the benefit of any reading this in the future, I have removed all but the first and last posts so that the initial problem statement and the solution remains.

I've also changed the generic subject line "ARM 3.2 Crashes" to "Crashes Because of Value Delay Line Actor Using Strings" so that people will immediately know what the source of the problem was.

Best Wishes,
Mark

@tlaloc said:

I got an M1 Mac mini and tried isadora on it with Rosetta 2. Izzy opened right up and snappily even. But so far the movie players only play audio. I am sure you are well aware of this but I just wanted you to have the Info.

Isadora 3 is not yet compatible with Big Sur because Apple just loves making life difficult for us developers. :-(

However, we have a beta that _is_ compatible and working well with Big Sur, and that will likely solve the problem.

If you want to sign up for the beta test program you we can let you try it.

Regardless, you can expect a the Big Sur compatible version to arrive soon into the new year.

Best Wishes,
Mark