Hi Thomas,
me too, have the same problem with the dark jetway glasses. Noticed this since the GSX-PBR Update, I thought I were the only one having this issue, so tried first many other settings ( also new Display Drivers ), but nothing helped.
My system config:
Win10/64Bit, 16GB RAM, P3Dv4.5 HF1, GSXL2 (PBR Update), Geforce GTX 1060/6GB with Driver 431.36
Hereby one screenshot of my home airport EDDV, using the jetways "ThyssenKrupp Apron drive-tunnel Crystal 38/19", other jetways have the same dark glasses, I don´t use any shader addons.
Regards, Pit.