Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Has anyone else noticed the change between 4.5 hotfix and 4.4 to the rendering methods of PBR materials on aircraft? It's very noticeable. Makes me think the hotfix was more scenery based rather than simobject based.
Eg same settings on stock as a rock P3d ( I have to ) what was dark is now washed out. Same video card drivers.
Install method was complete uninstall and clean of all p3d v4.4, restart computer , complete install of latest 4.5 all content/client. I know it's overkill but my computer is also a test computer and must remain stock as LM intended.

I have observed the same while developing scenery objects. After the update (updated client and content only) textures on PBR materials are washed out. I had to increase saturation on the albedo and also make it darker to reach the same color shade as before. I am using stock shaders.

Not sure why so many have had problems with this one.
I did my usual precautionary backup, downloaded the full package 'just in case', ran the client and all was well.
The most significant benefit so far has been with my Leonardo MB80 series, a trifle stuttery before, now smooth and clean.
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I can report the same positive change with my Leonardo MB80. Those stutters were few and not cyclic in nature but unpredictable and significant. Now, smooth as glass.