lPK25 stopped working with IOS7 - iPad 4 camera connection kit USB LPK25

I have been using the LPK25 with cubasis and other midi apps for ages, via the camera connection kit, mini USB to USB, no problem, it did say it was not supported and may not be reliable (or similar messgae) but always worked.. Until I took the IOS 7 plunge! Now I get the same message and it doesn't work. When I connect it, the lit buttons flash (like they always did), and I tried swapping the USB cable, the CCK is ok as it recognises other stuff. Is this IOS 7, a lower USB power threshold? or is my LPK broken?

Thanks, steely.
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