In the rfeditpro if the brush does nt have the name of some texture from the used txl texture library
after you close and reload the level the texture is nt displayed in the 3d viewport.
I mean i export .map brushes from max through a script,and all brushes are called noname when they are imported in rfeditpro.
you cant import brushes noname and then give them whatever name you want.
The only thing i thought to do to about this is to give textures explanatory names like arch01,Marquee01,Wall bottom01 etc so i can use them to the brushes and distinguish what some brushes are for.
I noticed i applied some texture,i saw it in the viewport but when i run the level the texture it has the name of it\s rendered instead of the one i last applied.
Im ok wit that,i wanted to mention it.Anyway i suspect that few import custom brushes and have these texture naming to take care.