I´ve searched but found no one else with the same problem
In FCP 7 my some clips get renamed by the same name as the sequence they have been edited into.
Also - when I copy a clip from one timeline to another, they behave like nested clips from that timeline instead of individual clips.
Thsi was no problem in FCP 6.
I have a clean install (New Mac Pro) and updated to 7.0.1