If the ST-i works properly without the Hub then it can't (shouldn't) be a problem with the camera. It very much looks like electronic noise, generated within the hub maybe. Are you powering the hub? If so, it might be a noisy PS. Lots of maybe's but the ST-i itself is a good one albeit less sensitive than the Lodestar. I got one for the shutter but switched back to the Lodestar for the sensitivity.
Charles
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