Problem
During the compiling of a Quake 4 MP map the following error may crop up;
WARNING : idCollisionModeManagerLocal::ChopWindingWithBrush: primitive [n] more than 128 windings
Where [n] is a number associated with the corrupted brush (primitive)
Solution
This happens for a similar reason to when the error crops up during Quake 3 map compiles as explained here (http://www.katsbits.com/smforum/index.php?topic=739.0).
As this error can happen with very large brushes try cutting large brushes into small segments.