Nick,   I have replaced the complete P3D main scenery folder with the default one (from my Acronis Backup). With your scenery.cfg in use, at this point only P3D default scenery and ORBX AU/YBUD scenery were active. But, the Problem was still there.   I got another YBUD exclude which solved the the problem. You can find a short discussion at avsim https://www.avsim.com/forums/topic/530825-p3d-guru-needed/   This means, that the ORBX exclude for YBUD did not work corr