Official comment
The engineers are aware of this issue and it will be addressed in the next update. We apologize for the inconvenience.
I've got an issue with my DDJ RX. The channel level indicator seems to stagger (laggy) when playing more than one song at a time and the lights for some of the buttons are not lighting up when you press the button. If you look at the corresponding icon in Rekordbox you can see if it's on or off by pressing the button multiple times but the button does not illuminate. Quantize and the Cue buttons on each channel for example, slip too.
Switching from hot cue to beat jump will also not display which is active on the DDJ until only one song is playing and the response time in changing from hot cue to beat jump is slow, takes a few seconds to catch up. These issues didn't start for me until I updated Rekordbox to 4.0.6. I've uninstalled and reinstalled twice to try and fix this but it still won't work right.
The engineers are aware of this issue and it will be addressed in the next update. We apologize for the inconvenience.
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Make sure you're running the latest firmware. If you're using a PC, make sure you install the latest drivers. They can be found here.
There is only one driver available and I have already uninstalled it, downloaded a new copy and reinstalled it. My firmware is up to 1.02 and no new updates are available. What else do you suggest?