Thanks, this works! 
Unfortunately… How do I say this, why is gluing clips that difficult?
I did what you told someone to do for gluing in 2016.
This works, but this action cannot be repeated. Super clips cannot be glued, WL will tell me with a message box that one of the clips is already a super clip.
Clips are not simply a bunch of sample data points in memory that I could really glue? I think I was expecting behavior that Reaper offers. I mean, so that the program, no matter what the clips do represent, makes out of it what looks like it is possible to do. I guess, even if clips are references to files or whatever, gluing looks like it would be possible, in theory.
The second option for a super clip that WL offers, external clip, crashed to desktop when I hit the apply button or whatever it is called.
Well, it is what it is.
Tried it again with different files, not write protected ones this time, the folder is also not write protected this time, completely new montage. I copied the Windows logoff sound .wav file to the Desktop folder and used this to start experimenting with clips.
The second super clip option, which offers to create an external audio montage, crashes. The Wavelab application window just disappears. In Wavelab Pro 10.0.40 (build 127).