CEONSS

Work well configured like this :

Pegasus wrote: - the PV is non-convex or otherwise irregularly shaped and that plays havoc with the contained actors' detection

I have already seen (rarely) somes blocking volumes that do not work without rebuild, may be they are vertex-editing or copy paste from another one, or a bsp hole somewhere.

Still didn't work. I'll upload the map later so maybe someone else can look at it. For now however, I have bigger problems. See this thread:
http://ceonss.net/viewtopic.php?f=2&t=740