Then I read your message about the new AtmoOrb sketch and flashed it. I don't know if it is related to that or some other stuff I did (tried getting mopidy running, but failed ), but now the orb is working after restart!
I have noticed another thing: As soon as hyperion is started with AtmobOrb set as device, all LEDs on all my switches are blinking like crazy even though the AtmoOrb should be (and is) off. Wouldn't it be better if the data is only transmitted when the orb has to display an actual color? I haven't noticed any problems like the network being slower or so, but I think this behaviour is a little strange.