I already re-installed it by downloading the appletv version of 0.7 from the wiki. First i just used the update mechanism of the plugin.
The permissions are correct as far as I can tell. Today I try to reinstall 0.65 and look what happens.

Edit: I reinstalled 0.65 and it worked like a charm. The seperators/section in the settings menu are there again. Holding down menu in quicktime playback doesn't show the main menu, so changing the audio track is possible. And yes, the eject icon is there as well.
Then I used the internal update mechanism to install 0.7. The same problems as above arose. The eject icon is in the ressource folder, the permissions are correct.
Don't know what to do. But I think, I'll wait till 0.8 comes up ;-)