Well - I spoke too soon. As shown above, I tried the latest version last night and the first set of 20 exposures guided perfectly (RMS of 0.3"). But after that - once I moved to a new target I was never able to get it to work. They made changes to the internal auto guider and whatever they did - it is now not usable for me. It took me an hour just to calibrate it well - and even then the guiding was never usable. I used up 4 hours of a perfect night trying. I then tried a few unguided exposures and I was able to get 180 second exposures at 2,000mm focal length - so the issue is with the guider, not the mount. So until this is fixed I am limited to 180 second shots, unguided.
PS: I always use 8 second guide exposures because anything less is not possible with an iOptron EC2 mount.

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