This evening I fixed the problem with AutoCycle. In the original code a graph object is created and deleted as required. In my code I created a single graph object and reused it. Since I copied the structure of the rest of the code this caused problems depending on the order in which routines were called. So now I create and delete a graph object at the same points as the original code. Basically the code is done. I can't do any more until I build the hardware, at which point more bugs will surface, but it means everything can be tested fully.