FLX10 + DMX Lighting + 2 Laptops

Hi,

I have an FLX10 and, using one laptop, my lighting rig works fine and as expected with Rekordbox lighting as it did with my old RB-DMX1.

I recently did a B2B gig using my FLX10 with my lighting rig connected as usual. We used two laptops connected to the A and B USB ports. Both laptops had the same lighting configuration and all songs were phrase analysed. All lighting fixtures were configured as before.

We found that the lighting didn't seem to be responding as we would expect? In fact there didn't seem to be a DMX signal at all when playing from either laptop?

I can't find any literature at all on this kind of B2B setup using the FLX10 and Rekordbox lighting. Is the lighting function supported with 2 laptops?

Thanks

Max