John Tiller's Campaign Series (Matrix) Scenario editor glitch

[CelerEtAudax]

I have made a couple of East Front scenarios with the editors.   The default turn value was 30. I tried to re-set it to 20 as follows: 1-20(d) When I hit the save button, a box came up with the following information: Invalid input
Invalid turn value(s) I tried entering different figures, but the only one it would accept was the default value of 30. 
 
I then cleared the box and typed the value myself, using the format shown in the manual, but to no avail .  I would be very grateful if you could find a solution to this problem.  


Thanks in advance, Richard

P.S.  I have just tried sending the scenario files as an attachment, but the robot told me that that sort of attachment was not allowed.