I know that M1 Mac's aren't supported fully yet but wanted to point out a consistent issue I have found in the hope it helps with the transition. If I load a clip into the sample player, generate a thumbnail and then try and move it to another slot, ME shuts down. It doesn't matter what type of clip it is, but if it has a. thumbnail, it happens every time. If I don't generate a thumbnail, it lets me move the clip no problems. I'm running Big Sur - 11.2.3 and ME - Version 3.4.2 (3.4.2.05) If there is a dedicated area to report issues and I've missed it then apologises.