The DDJ-400 certainly does work - looks like the software may not be detecting it properly, or you have a mode enabled (such as Video or DVS) which is not allowed by the 400.
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Software was working fine until I reistered my device 
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The DDJ-400 certainly does work - looks like the software may not be detecting it properly, or you have a mode enabled (such as Video or DVS) which is not allowed by the 400.