I've been wracking my brain for hours trying to sort out a leak most likely caused by some portal calculations gone haywire. I dug this out of the compile log after stripping the map down to nothing but geometry and still getting a leak that generates no pointfile. Code: FindPortalSide: Couldn't find a good match for which brush to assign to a portal near (2234.0 0.0 -386.0) Leaf 0 contents: CONTENTS_SOLID Leaf 1 contents: viscontents (node 0 contents ^ node 1 contents): CONTENTS_SOLID This means that none of the brushes in leaf 0 or 1 that touches the portal has CONTENTS_SOLID Check for a huge brush enclosing the coordinates above that has contents CONTENTS_SOLID I'm not very well versed in the mechanics behind portalflow and the like so this is way over my head. On the plus side stripping the map bare has shown a bunch of things I need to fix besides the giant killer leak. Thanks in advance to any guru who can help me out. Feel free to berate me for poor mapping technique, I'm sure it was carelessness that caused it to start with.