"It sounds like the Beo5 sending the option settings to the Beo devices could be my problem."
Yes.
"When does the Beo5 actually "send" these settings? So far I just uploaded the config to the Beo5 and then switched on the TV or stereo. No idea if and when the option settings were transmitted."
I`m not sure, but I think it will be sent after you have sent the config. to Beo5. I do all the programming/configuring with myBeo4.
"So I have the faint feeling that my 1-1 configuration was never sent to the devices in the first place..."
Try that once more and keep your Beos in standby - for option setting they must be in standby mode, and the Stdby LED will flash when receiving a new option.
"Do I have to "tell" the Beo5 to send the option settings to the devices? Or can I somehow set the devices to opt 1-1 manually?"
I`m not at home, so I have no Beo5 right now. But check the service menu on Beo5: STDBY + GO (Setup) - 0 - 0 - GO.
Stefan