Not applicable anymore.

This happened to me several times, usually when monster is very close to player and (probably) calls CanSee; I could catch this only when running debug build of Vavoom from MSVS, otherwise game just hangs without any error messages. Error is:

Unhandled exception at 0x007b3a5a in Vavoom.exe: 0xC00000FD: Stack overflow

Stack Trace:

PointOnSide2
CrossBSPNode (few times)
TraceLine
CanSee

Just in case, values of PointOnSide2 variables: point = {1040.4779, -546.85608, 175.33376} dist = -800.0 normal: {-1.0, -0.0, 0.0}