I tried another 3 adapters, including the AIFFECT and an explicit active adapter (Delock). Every time there was a window server crash. Strangely, every adapter showed the picture, only a login is no longer possible. I am giving up now with other adapters. Still, thanks for your help.
But still one more thing:
Is it possible to reimplement the function SLSGetOnlineDisplayList in the Skylightwrapper to point to the original definition in the Skylightoriginal file, except catching this !CGSRunningInServer() assertion? If it is worth, i can try to do it.
I found out, that this assertion is thrown, if the skylight library is not loaded in the window server context, maybe due to the crash of it.