Discover DJ - MIDI problem?

I'm not sure if this is a software or hardware problem, but let me know what you think...
The Discover controller works perfectly except for one huge flaw with the right platter. The right platter only works in search mode (when it acts like a pitch fader). When in scratch mode, the right platter doesn't work (doesn't scratch). When paused, the right platter doesn't work (doesn't scan/skip though the song like a CD player).
The left platter works perfectly, as does almost everything else.
I'm running Windows XP SP3 on two different computers. The same right platter problem happens on both computers.
The Discover controller works perfectly except for one huge flaw with the right platter. The right platter only works in search mode (when it acts like a pitch fader). When in scratch mode, the right platter doesn't work (doesn't scratch). When paused, the right platter doesn't work (doesn't scan/skip though the song like a CD player).
The left platter works perfectly, as does almost everything else.
I'm running Windows XP SP3 on two different computers. The same right platter problem happens on both computers.