I have a speed/cadence sensor which has been working fine with my Edge 530 and Varia radar rear light. I have just purchased a Varia UT800 headlight to add to the lighting network. It's paired OK but now my Edge 530 doesn't display cadence (i.e. just a blank reading) although the speed still displays OK. Even more oddly, the speed/cadence sensor is still showing as paired/connected with my Edge 530, and not reporting any errors. Any ideas on what the issue is, and how to resolve? Thanks.