Wahoo RPM and Zwift

I am trying to use a Wahoo RPM cadence sensor on Zwift but am experiencing some problems. I use Zwift on an Android tablet which connects to the RPM but shows strange cadence readings. It flits between the actual reading and a reading of 1 every second or so. I tried using Zwift on my Android phone and got the same problem. I also connected to the Wahoo Utility app which showed the right readings so I know there is no problem with the RPM itself.
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I have found that generally in android zwift if you pair a smart trainer you have to pair everything through that (controllable, power and cadence) or the other sensors won't work correctly.
It is still in beta at the moment so i guess issues are to be expected.