Hi,
I scanned all my AFCAD files with 'Scan AFCAD' but it found no double files for LSZH.
However it is caused by an AFCAD file... but I don't know which. Nevertheless I solved the problem.
My scenery priority was as follows:
1. AES-Basepack
2. AFCAD Files (I have a dedicated folder with all, well most, AFCAD files: Add-ons, Ultimate Traffic, etc)
3. Zurich
4. Zurich Terrain
After I increased Zurich + Terrain to 2nd and 3rd prio and the AFCAD folder to 4th, the scenery loads OK.
So it is an AFCAD file but I can't tell which
Anyway, problem solved here.