Something to try...I was having the same issue, and just stumbled on a workaround...
I'm using (but I'm not sure if there is a specific issue with) UAD Apollos for my audio interfaces. I turned them off while starting up Notion. After Notion was open, I was able to turn on the Apollo and select it as my Audio Device in Notion.
EDIT/UPDATE: Once I re-selected the Apollo as my audio device, Notion crashed again.