crashing during mp host

[routinet]

Everytime I host a multiplayer game, KF eventually crashes. It can happen at any time, with no discernible pattern. Here's the crash messages:

 Build UT2004_Build_[2004-11-11_10.48]

OS: Windows NT 6.1 (Build: 7600)
CPU: AuthenticAMD Unknown processor @ 2813 MHz with 4093MB RAM
Video: ATI Radeon HD 4850 (29)

General protection fault!

History: SkeletalMeshGet <- USpriteEmitter::UpdateParticles <- AEmitter::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=2) <- TickLevel <- UGameEngine::Tick <- Level KF-Farm <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free



 Build UT2004_Build_[2004-11-11_10.48]

OS: Windows NT 6.1 (Build: 7600)
CPU: AuthenticAMD Unknown processor @ 2813 MHz with 4093MB RAM
Video: ATI Radeon HD 4850 (29)

General protection fault!

History: SkeletalMeshGet <- USpriteEmitter::UpdateParticles <- AEmitter::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=2) <- TickLevel <- UGameEngine::Tick <- Level KF-Farm <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free



 Build UT2004_Build_[2004-11-11_10.48]

OS: Windows NT 6.1 (Build: 7600)
CPU: AuthenticAMD Unknown processor @ 2813 MHz with 4093MB RAM
Video: ATI Radeon HD 4850 (1059)

General protection fault!

History: USpriteEmitter::UpdateParticles <- AEmitter::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=2) <- TickLevel <- UGameEngine::Tick <- Level KF-Farm <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free


 Build UT2004_Build_[2004-11-11_10.48]

OS: Windows NT 6.1 (Build: 7600)
CPU: AuthenticAMD Unknown processor @ 2813 MHz with 4093MB RAM
Video: ATI Radeon HD 4850 (1059)

General protection fault!

History: SkeletalMeshGet <- USpriteEmitter::UpdateParticles <- AEmitter::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=2) <- TickLevel <- UGameEngine::Tick <- Level KF-Farm <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free

killingfloor.log attached.