I think not useless! So we are narrowing the problem down to certainly not mythfrontend. I notice in the process listing there is something called 'SCREEN' before each device running. I am thinking that mythfrontend kicks off and whatever is supposed to keep it running in focus (though I'm hesitant to use focus) loses it and it may be trying to go back to pluto. Part of the issue may be that myth likes to take control from window manager and there is a struggle between pluto and myth over the xserver.
A few thoughts on this:
1) It's not a focus issue, because you can see the mythfrontend process starting up, and then disappearing at the same time the display goes grey.
2) LMCE runs mythfrontend with the '-w' switch (run in window), and in this mode myth doesn't do anything unusual with the window manager.
Also, I don't think it's an issue of LMCE ending the mythfrontend process, because then the orbiter would return to the screensaver and the default control layout. The fact that we get a grey screen, and that when you return to the orbiter you see the myth controls menu, means that the orbiter doesn't even know that myth died...
BTW, after myth dies and you're in the grey screen, just hit F7 to get back to the orbiter. Then select "quit" from the menu to end the myth control process and return to normal.
Does anyone have myth working correctly???
How I'd love for that to be answered...