No display of bars on display of CDJ-2000Nexus

You have to clear the files from your device and re-export them.

ok, so much I know now re the external drive (for export), but what about the analysed Rekordbox files? I even need to reimport and reanalyze them?

not re-import to rekordbox- rather re-export to your external drive/USB/SD Card. I formatted a bunch of my SD cards & 2 hard drives after getting my 3 CDJ-2000nexus players just to get the wave form and beat grid info. 

So yeah clear your collection from the drive and re-export (after "analyze missing data" is all complete) it should work ;)

Sorry, I was not clear here I guess, be. cause your answer doesnt help yet.

My files IN Rekordbox are fully analysed

Since they are all good in rekordbox (no blue icon next to the tracks) now delete everything on your USB/hard drive/SD card that you use with the CDJ2000nexus and re-export them... if you don't delete them from the device rekordbox will see the tracks are already there and wont re-export them. 

Basically you should do a fresh 'export' of every track after it's been analyzed in rekordbox 2.01 or higher

making sense?

Yes, it does.

Sorry for my short statement, I typed from cell phone and 'whush', it submitted the unfinished comment of mine :-)

will revert when I tested it. Thanks a lot so far.

@David > Just to be clear on the process, you need to update rekordbox to 2.0.1. Then you need to analyse the files for missing data. Then you need to freshly export those tracks to your FAT32 formatted USB sticks and then play on the players. All should be fine then.