Sun Ray 2 - Connecting to monitor with USB Hub issues

Hi,
We recently purchased 21 Sun Ray 2 devices and 21 Dell 1909W monitors with built in USB ports to go with them.
This combination works great with 17 of the Sun Ray 2 devices, i.e. mouse and keyboard connected to USB ports on monitor then A to B USB cable running from Sun Ray 2 to Dell monitor.
However, on 4 of the setups this combination fails to work, and after troubleshooting we identified neither the Sun Ray 2 or Dell monitors were faulty. Our support agents suggested since Dell could use a different USB hub 'engine' for their monitors (Even the same model of monitor) this may cause problems being picked up by the Sun Ray 2 devices.
After trying out a box of spare A to B USB cables we had lying around spare, surprisingly 3 of the 4 before non working devices are now working. However, if the 'magic' leads were to be stolen etc we would have a problem again!
Are there any sorts of firmware updates etc for the Sun Ray 2 devices that would mean we could get all the monitors working with the standard Dell provided A to B USB cables? At the moment the optical light on the mouse will 'blink' and then nothing else will happen (It does 'blink' on the working setups before getting full power).
Many thanks :)
John

no I tried with bro's iPod which have 4.x firmaware and it works fine. So I guess it's safe to assume this is problem because of firmware

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