I upgraded from R5D1 to R5E50 yesterday and all went well, I rebooted the system last night and when it came back up the backend didn't restart, I had to exit the front end and open a terminal window and manually start it by typing "mythbackend" and then restart the frontend and everything was fine, I tried this multiple times and each time the backend didn't start.

I don't have the logs but where is the command to start the backend located in the startup?

Thanks

See TJC's upgrade notes.