Elektron Musical Instruments

ok, when i plugged my mnm into my cheezy yamaha psr-510 midi keyboard 
things seemed great off the bat. i was recording MIDI from my 
keyboard and the notes were playing back inot it, I could even get 
different instruments out of the keyboard using PCHG and fancy jazz.

then i hit some shit, i don't know what, and all of the notes in my 
MIDI tracks turned to "---" ... and anytime i try to record new notes 
or lay notes down using grid based composing i get nothing but "---"

i have the keyboard's midi sending only to OUT (CH9) which goes into 
the mnm's IN (CH9, set for AUTO TRACK). 

i know there are a ton of MIDI settings on the MnM and just as many 
for my keyboard (i can rattle them off if it would help the 
situation), but has anyone experienced "---"??? i'm bumed because it 
worked so well straight off, and now it's a huge mess :[

thanks for any tips!
j.ordan

the manual has been read and i didn't see anything about "---" ... 
forgive me if i missed that useful page .. . . and please provide me 
with the number ;D