These are the latest firmware updates I was given by DSI... they fixed the MIDI bug I was having.  As far as I know, they add no functionality, so unless you are having problems with your keyboard already, update at your own risk!  To see what your PEK has installed, press and hold the "Reset" button and press the "1" button.  Current firmware is:

Main 1.5
Voice 2.1
DSP 3.0

from DSI: 
"There are a couple of freeware sysex librarians we recommend for updating the software. For Windows, there is MIDI-OX; for Mac OS X, there is SysEx Librarian. The only thing you really need to be aware of is that there should be no other MIDI data (not even clocks) present while you update the firmware."

I used SysEx Librarian, worked like a charm!