I also have the problem that my NetRadiant (I downloaded
the package already configured for OA) does not show some textures (e.g. the portable medkit... I said that
some weeks ago, but had no clear answers about that). Maybe shaderlist.txt needs some tweak?
Although I only briefly used NetRadiant to add the TA and OA-specific items (then returned to Q3Radiant -under Q3- to continue mapping), I'm still curious to know what's the reason for that.
At least with Q3radiant,
some properties of shaders do not work if the shader file is not in your shaderlist.txt (e.g. I made a transparent shader, and in the game it looked correctly animated and transparent, but it was not effectively
incorporeal before I also placed it in shaderlist.txt). I don't know if this applies to NetRadiant, too.