Tim.
Ok. I've had a play.
First I uninstalled and reinstalled and the problem was still there. I then realised that I didn't need a route loaded, the fault was still there regardless.
I realised that I had all the european data loaded, to plan for a trip into france, but when I installed the latest version I also installed the USA data, to plan for my holiday.
I deleted the USA data and now it's fine.
Hope this helps.
Hugh.