I have a block of water inside a box made of regular dev brushes. The top is open of course. The problem is when I run the map and I look down into that box...not only do I not see water, but I cant even see the bottom of the box. Its like the bottom is open. My block of water has no draw on all sides except the top of course, which has a water texture. Anyone have any idea what I'm doing wrong? or is source just being buggy?