[Thomfam]

I am suspecting this is a Kodi 19 thing as I get the same outcome if I try the PlexKodiConnect addon.

Can't speak for composite but pkc definitely works with matrix so it sounds like an issue with your setups.

Composite also works with matrix, so definitely more of a local issue.

I am guessing it is my SMB settings in "Services".  I've tried using the Plex Server's name OldPC, I've tried using the IP of the OldPC Plex is installed on 192.168.0.67.  I've set the minimum to SMB1 and left the other settings to default.  Some shows do play but all take a while to load.  However there are problems with any file which goes for longer than 60 minutes, longer files don't open. 

When Kodi crashes I get a blue icon at the top of the screen and two options to either open or stop. If I hit open. Kodi reopens and nothing is playing.

I'll keep trying and see if I can solve it.