Which exact version of P3D? Which exact version of the Airbus? To which folder did you install it?

Did you install the Addons below your Documents\P3D-V5 Addons folder? If so, deinstall them and use a Folder like c:\P3DV5-Addons as Installfolder for your addons. The Documents P3D folder are not usable for Addons, which register them via P3D Exe parameters.  Also don‘t use folders below the Installfolder of P3D and Not a Folder below c:\Program-files or other windows system directories.

Ok,  I think i want to end this discussion here .  One Problem different opinions here . Fact is for me ( maybe not for others ) that i dont want to use the A320 with this kind of Livery Textures.  And youre right - this is now my Problem .  Thanks for your explanations.    If you want you can close this Post now .         

If the legacy shader has bug, it’s a problem of LM. To use the old model for the professional series was decision to be able to use the thousands of existing livery. You bought a v4 non PBR. You got v5 for free. But it is not our responsibility to transfer to PBR just because LM has introduced a bug. PBR would also break all existing livery.