If this is a map, it could mean a problem with the lighting, texturing, geometry, or layout; try the Cube Wiki for tips on using the engine. Should it be some other form of content, then it may need to be elaborated upon to be worth something.
Map designed for duels or small instagibs/ffa. It's currently in beta, so if you have some suggestions (or you notice some glitches) please let me know.