idCollisionModeManagerLocal::ChopWindingWithBrush:

[kat]

Problem
During the compiling of a Quake 4 MP map the following error may crop up;

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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.

As this error can happen with very large brushes try cutting large brushes into small segments.