Thank you, Eric! That works really well and seems to solve the problem.

Now a question for you Franz. If I'm using an eBoard I can take back the moves and they appear in Arena correctly. Rather than use the Save/Copy FEN on the Arena screen I thought I would try simulating that by removing the kings on the eBoard and then just replacing then again. That is how you setup positions in Arena using an eBoard, and in this case I'm just setting it to the new position after the takebacks. But rather than calling 'Setup' in your modules it seems to call 'Edit', which it says isn't supported. How hard would it be to make 'Edit' act the same as 'Setup' so that the process could be completed without using the screen?

Anyway, thank you Franz for all your work. You will get to retire from this one day I'm sure!