r3581. creating a prim or rezzing a prim from inventory causes region exception, region becomes unresponsive to client. region doesnt crash completely. client can logout and back in. region console exception follows:

[APPLICATION]:
APPLICATION EXCEPTION DETECTED: System.UnhandledExceptionEventArgs

Exception: System.NullReferenceException: Object reference not set to an instanc                                                                                                                     e of an object
  at System.Drawing.KnownColors.FromKnownColor (KnownColor kc) [0x00000]
  at System.Drawing.Color.get_Black () [0x00000]
  at OpenSim.Region.Environment.Scenes.SceneObjectPart..ctor (UInt64 regionHandl                                                                                                                     e, OpenSim.Region.Environment.Scenes.SceneObjectGroup parent, LLUUID ownerID, UI                                                                                                                     nt32 localID, OpenSim.Framework.PrimitiveBaseShape shape, LLVector3 groupPositio                                                                                                                     n, LLQuaternion rotationOffset, LLVector3 offsetPosition) [0x00000]
  at OpenSim.Region.Environment.Scenes.SceneObjectGroup..ctor (OpenSim.Region.En                                                                                                                     vironment.Scenes.Scene scene, UInt64 regionHandle, LLUUID ownerID, UInt32 localI                                                                                                                     D, LLVector3 pos, LLQuaternion rot, OpenSim.Framework.PrimitiveBaseShape shape)                                                                                                                      [0x00000]
  at OpenSim.Region.Environment.Scenes.Scene.AddNewPrim (LLUUID ownerID, LLVecto                                                                                                                     r3 pos, LLQuaternion rot, OpenSim.Framework.PrimitiveBaseShape shape) [0x00000]
  at OpenSim.Region.Environment.Scenes.Scene.AddNewPrim (LLUUID ownerID, LLVecto                                                                                                                     r3 RayEnd, LLQuaternion rot, OpenSim.Framework.PrimitiveBaseShape shape, Byte by                                                                                                                     passRaycast, LLVector3 RayStart, LLUUID RayTargetID, Byte RayEndIsIntersection)                                                                                                                      [0x00000]
  at OpenSim.Region.ClientStack.ClientView.ProcessInPacket (libsecondlife.Packet                                                                                                                     s.Packet Pack) [0x00000]
  at OpenSim.Region.ClientStack.ClientView.ClientLoop () [0x00000]
  at OpenSim.Region.ClientStack.ClientView.AuthUser () [0x00000]
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()

Application is terminating: True