No I was not running it alone, here is my mutie command-line.
EAS-INF-ReactorSector46?game=INF_GameTypes.INFg_EASGame?mutator=GameSwitcher.GameSwitcherMut,INF_Mutators.RollingM67,INF_Mutators.NoScopes,SilentCapture.SilentCaptureMut,ReportDirection.RDMutator,UTCompass.UTCompassMut,SpeechPad_051.SpeechPad,new40mm.new40mm,bulletsounds40mm.bulletsounds40mm LOG=UT440InfSVR.log INI=S.ini USERINI=U.ini
If I put in your bulletsounds40mm.bulletsounds40mm Clients Hang. Now if I do not use GameSwitch all is okay. So there is something on map switch that is not going right with those two mutators.
Also, I just found this. I could run bulletsounds40mm with GameSwitcher if I removed SpeechPad and UTCompass.
Crap, to many mutators to figure out which one is the casue..... The only common mutie when it breaks is GameSwitcher