Whoa! You're right, finally fired up the beta and was greeted with this:

Hey Guys. I just installed this on my Retina MacBook Pro SSD (El Capitan) - when I fired up Rekordbox the three on screen video monitors are just block yellow and can't be used. I noticed that the three screens on my RZX all go block yellow for a few seconds as the software boots up. I tried shutting the Mac down and rebooting it, but the problem remains. Luckily, I've reinstalled 4.2.5 without any apparent (new) issues. Cheers
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Whoa! You're right, finally fired up the beta and was greeted with this:

Dear Sir,
We have some kinds of graphics issues on NVIDIA chipset right now (4.2.6 beta).
So Please switch Intel chipset on your PC( or Laptop) if you can.
We apologize for the inconvenience.
Thanks.
Ah yes, using gfxCardStatus I was able to force it and it worked.
Thank you Mike :-)