Ghostly White MIDI Tracks Won't Playback

[mm8filmmaker]

Thanks in advance......
Situation: Mac OS X 10.7.4, ProTools 10

I scored my first short film (HUZZAH!) by recording MIDI data from my MM8 keyboard through its USB cord to different instrument tracks. I added several instrument plug-ins (Mini Grand, Xpand2). Everything was going swimmingly...

UNTIL....

I gave the editors the score's WAV files but wanted to also include the actual ProTools project file so they could change parts if they wanted (I can't fade in and fade out MIDI nor lesson the muddiness of the sustain pedal in places.....that's another question for another post). When I emailed it (a 111kb file)..... (Tell me people, is this a BIG NO-NO to email ProTools projects? I later used WeTransfer and it was much faster.) The film editors called and said that the received ProTools file wouldn't fully playback sound. Only one MIDI instrument track was blue (and would playback)....but ALL the REST were whited-out and impossible to playback (even though all the MIDI information(piano notes) displayed correctly on these whited-out tracks). Immediately, I hung up the phone, and opened my ProTools file on my computer (thinking I had accidentally selected only one track and muted the rest).......but, the exact SAME issue appeared on my file. There is one blue (editable) track and ALL the rest are like ghost tracks, whited out and silent. My other ProTools projects are normal (all blue active tracks), so it's only this one project that's affected. Google Search already advised to change options and sync timeline/track and edit selection.....but that had no effect! What do I do?

UPDATE: After freaking out and thinking I had lost all the MIDI information, I instead opened a recovered file where I found all the instrument tracks to be blue, active, and editable. Whew....at this point, I'm just really curious as to what transpired....and how to avoid it in the future Does anyone have experience with this issue?