Im having the same problem at first I thought it was just me but apparently not. I also have the latest version of ScripHook.
I get the following errors -
Error in script 'vDH.Phelper"
Error during PerFrameDrawing in script 'vDH.Phelper';
Sripthook logs -
2013-03-14 15:21:56 - Error during PerFrameDrawing in script 'vdH.PHelper':
System.MissingMethodException: Method not found: 'Boolean GTA.Game.Exists(GTA.base.Object)'.
at vdH.DeviceDrawClass.PoliceHelperDraw(Object sender, GraphicsEventArgs e)
at GTA.Script.DoPerFrameDrawing(GraphicsEventArgs Graphics)
at GTA.RemoteScriptDomain.PerFrameDrawing()
2013-03-14 15:22:00 - ...successfully started script 'FDLC.LCFireRescue'!
2013-03-14 15:22:07 - Direct3D device lost!
2013-03-14 15:22:07 - SCRIPTS TERMINATED!