When I try to place a custom texture in a map, it pops up in the texture window just fine, it's placed onto a brush no problem, but when I play the map in game, the texture turns into the "texture not found" grey and white box, as if the texture doesn't exist, though a textures folder is in my base folder, and the file path should be correct. It's probably a problem with the texture image itself, but any help would be invaluable.