@MIB88: I got a quest at the BOS Bunker that takes me down to the BOS facility.
And regarding Vault 23, I'm talking about the elevator in the shack-area. Also I can walk through and behind the elevator, and I can scroll too far up so that the mountain ends and I can see normal ground.
@Nirran: Ah thank you very much, I overread your reply before, this bug's erased now :)
Yet I came across another bug , in Valut 23 and the BOS Facility I cannot use the elevator. When stepping inside nothing happens.
I just realized that this bug appears only after loading a savegame, while at the moment of saving everythings fine. There's probably an error at the saving process...
I played the mod for two days now. Everything is running fine, but all the time my character's perception drops slowly to 1, while my AC is rising. My radiation also sometimes rises without being in radiated areas.
Have been using a savegame-editor to fix it, but it diminuishes the fun a little...