I have various func_brush's that I am using around my map because they all receive the 'color' input at various points. My problem is that some of these brushes keep disappearing when viewed from certain points in the map. I had assumed it was a visibility issue and checked my portal file, and could not see anything out of order - As in, I could stand in one visleaf that should be able to see a specific brush, but in game it won't render the brush. I've even tried adding a func_viscluster to the effected areas and it doesn't change anything. What's also confusing me is that its not all the func_brush's, or where I have 2 identical (bar their names) func_brushes acting differently. Can anyone suggest why this is happening and how to fix it?