I have the same issue. Plex starts for about 1 minute then crashes. Hopefully there will be a fix soon. I appreciate any help!
I downgraded, remover temp files, did a repair in setup, still no fix.
Once I did the downgrade it seems to start up but doesnt play anything. Just the buffer symbol on the screen.
I been running plex for 8 years and never had this problem. I would hate to have to start over again.