[Milhouse]

I use this addon: http://ls80.github.io/script.openelec.rpi.config/

Both settings related to disabling CEC are checked. Not sure what values this addon sets or generates. Have my Raspi since one week...
The message pops up right after boot. Something like: CEC Adapter not connected with a red sign beside it.

It's quite possible that addon is setting options that are no longer recommended.

In order to understand what options you have set that might be the cause of this problem, can you login to your Pi with ssh then run the following command:

Code:

pastebinit /flash/config.txt

and paste the url - thanks.

Edit: Note: If you use this addon to disable the CEC hardware of the Pi (hdmi_ignore_cec=1, hdmi_ignore_cec_init=1), but don't actually disable the CEC Adapter in the Settings -> System -> Input devices -> Peripherals -> CEC Adapter -> Enabled [unchecked], then of course the adapter is going to try and configure itself on startup, fail, and notify you of the failure with popups. This particular configuration (hardware disabled, but adapter enabled) may also cause XBMC to crash during or after playback (it does mine, after a quick test).

So don't add those CEC options to your /flash/config.txt, and simply disable the CEC adapter via XBMC Settings.