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OK - did some testing the other day. Findings:
1. it doesn't help to just run the laptop off its battery.
2. I have moved the USB-Serial to the hub - thanks Marc!
3. The main problem looks like it was the 550D power supply - although I did not test running the camera on its battery with the USB-serial in its original position (as per pic in original post)
I have ordered 2 usb isolators, one of which I will put in front of the hub, and if I still get problems I will put one between the 550D and the hub.
Will update once they are delivered.
Adam
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