Problem solved , powerbase ok , but the solution has caused me another problem.
The problem was that I was running an odd amount of corner lane switchers , it seems these must be used in even numbers throughout a track. I tried a basic oval without any lane switch corners and everything worked properly so I put 1 lane switch corner in and the problem re-occurred. I put a second lane switch corner in and everything worked properly and so I put a third lane switch corner in and , yep , same problem. So now I know I must have an even number throughout the track which now leads me to another problem,
I have limited space ( 3m x 2.4m) and but I still want a decent length interesting enough track. If I had to split my area in half to create a symmetrical track I think this would be very limiting and not all that interesting. So how do I create an asymmetrical track ? Is there a lane switch piece that can be used singularly such as in a straight section or am I damned to symmetrical track setups ?