[zipzapp]

If some maps work and some don't, there may be something wrong with the related map files due to downloading or unzipping them. Unpack some and have a look at them with something like gimp. If they are ok pack and try the map again. The same with the outNstationary.txt. Or just download and unzip again.

If just your own map doesn't work be shure that the tga-files dont have a alpha-chanel (Transparency) and also are packed (ending with .pak) and fit the name scheme.

At what moment does that flaw occur? When loading the map or after displaying it? At what action?