Thanks Kinch!
Ajay, it does not surprise me that Vince has been able to test the wheel with SGP for 700 position changes. I can sit there and manually change the filter position all day long too. I never have a problem with that. The problem has only happened during an imaging run.
Last night I increased the filter delay from 15s to 20s and had a successful run all night long. I was shooting LRGB and cycled through events, so every new image required a filter change as well as auto focus and meridian flip. No problems. So this has me wondering if there is too much traffic on the USB line and setting the delay spreads it out more, allowing the communication to complete.
I believe if I get rid of the filter delay the problem will crop up much more quickly. I'll test that out. I will test with Artemis Capture as well.
Considering I'm a MOD on this forum, in my supreme over-lordship of this forum I will declare that for now this thread is fine. I'm glad to move the discussion over to the Atik forum as well, but I had not received any replies there. Perhaps I will summarize this discussion over there.