CDJ 2000 won't read USB but CDJ 2000 Nexus will

I just upgraded to Rekordbox 4.0.8 and synced with both of my usual USBs.  They've both been working perfectly with my CDJ 2000 and CDJ 2000 Nexus.  However, just today, the 2000 won't read either of the USBs.  I've tried reformatting them.  I've tried re-loading everything.  Still, only the Nexus will read them, not the old 2000.  

Any ideas?  Help!  Need these to work for a gig I have on Friday!  Otherwise guess I'm burning some CDs!