Thanks a lot Julien. I just changed to "Wait" and it works perfectly even with very small time delay. I had never actually understood the difference between the two VIs until I read that explanation. Many thanks.
Btw, I have another question regarding the time delay. Is there any simple way to have the time delay elapsed before the loop starts the first step? I'm thinking of having a sequence structure with just the time delay in the first frame and the loop in the following frame. Any better way? Thanks,
