I've recently been working on a map involving a LOT of water (i.e. the sea). Basically, it's a huge brush with nodraw on all surfaces except the top (which i've been changing frequently to try different water textures) as I've been shown in some online tutorials. The skybox ends at the bottom, where i've put a sand textured ground and invisble walls to close the water in. I removed the bottom skybox for the ground however (if that has anything to do with it. When I preview it with "shaded/ texture 3D view" it shows up really nicely. BUT--when I "Run Map", it decides to become invisble on the top surface, showing everything on top (props, ships, stuff) floating in mid-air. And everything (props, stuff except the sand ground which is visble) underneath where the surface should be dissapears and only reappears when I dive under. D: So, er, may the force be with you in solving this? P.S. Arrrr!