I get this error when I put one down:
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2012-07-12 18:35:49 - Error during Tick in script 'SpikeStrip.net.spikestrip':
System.MissingMethodException: Method not found: 'Void GTA.Vehicle.BurstTire(GTA.VehicleWheel)'.
at SpikeStrip.net.spikestrip.check_position_TICK(Object sender, EventArgs e)
at GTA.Timer.EachTick(Object sender, EventArgs e)
at GTA.Script.DoTick()
at GTA.ScriptThread.OnTick()
2012-07-12 18:35:49 - Error in Thread.Abort:
System.Threading.ThreadAbortException: Thread was being aborted.
at System.Threading.Thread.AbortInternal()
at System.Threading.Thread.Abort()
at GTA.NetThread.Abort()
2012-07-12 18:36:34 - Direct3D device lost!
2012-07-12 18:36:35 - SCRIPTS TERMINATED!
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The spikestrip is visible, but It can't pop any tyres. Also, I have the same problem with facing north as the others.