Casio CZ/ VZ/ FZ - Pro Series

>I've had VZ10m for a couple of days. Trying to use Midiquest module to
>edit patches without success. I have set the recv/xmit channels on the
>VZ and set mem. protect off. When The only thing I manage to get is a
>"MIDI buffer full". Also, do I have to set Sysex to enable every time
>I power on?

I've had this problem before, think it has to do with data being sent to the 
VZ faster than it can handle.