I'd bought a 9100 from motorsandrotors and phoned them when this problem was shown on RCU-I think it was Dave I spoke with and he said he'd contacted Horizon UK and told them of the problem-they looked into it and they sent him this cure.
I'm guessing it must have come via Horizon in the USA as they are a linked company.

Good to see the British end working well with M & R and Horizon UK.

Matt