Your inclinations are the same as mine. I tried all of the above and was exasperated to find they didn’t help – that’s why I came here – and it took a bit of finding…
But it has all worked out alright, thanks to the grace of gremlins and sods law, or whatever…. I was entering stuff and it said I should make backups did I want to do it now so I clicked on that and then it started asking me about serial number of my installation etc., and opening windows… I clicked to close one of those windows having decided it wasn’t worth it….
and it shut the whole thing down.
and then my computer froze. unrelated? I don’t know.
so a cold boot later I’m up again and everything seems find.
So I reckon just ‘exit’ is how you end a Myob session.