in Tweaker folder (your MOD), see if in the gp4tweak.ini file the following lines are enabled:
MeshProtect = 0, set to 1 to enable encrypted * GP4. Gp4 file supports mesh
TextureProtect = 0, set to 1 to enable encrypted * GP4. Texture tex file supports
can also be unintentionally, in the construction parts (blocked) were used. but, i'm only guessing because i'm not sure, ok? the only mod that I know have this kind of protection (intentional) is the 2006 MOD.
[]´s
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