With the 2020.3.4 release, it appears that a few of Helijah's aircraft in FGAddon have fallen victim to a bug where their windows/windshields/canopies become completely opaque (usually a shade of brown or gray) from both the inside and outside, which (obviously) prohibits flying from any of the interior views. Does anyone know the cause of this bug (and/or how to fix), and have you experienced it?
2020.3.5 is also affected, but prior versions seem fine (?)
Affected aircraft that I've found so far:
De Havilland DH 89
Yak 18 T
Fairchild C119
SAAB Jas 39 Gripen
B 24 Liberator
Note that not all of Helijah's aircraft in FGAddon are affected by this, e.g. the C130, Stampe SV4, and Dassault/Dornier Alphajet (among most others) still work fine.