Audio disappears in iMovie '11 --why oh why?

working on a movie for days and days.
movie is about 20 minutes long.
it's got a lot of transitions & slow motion speeds.
i waste a great deal of time with the audio.
on most of the clips, i use the audio from within the clip.
i additionally add some audio that was detached from the source/Events footage.
i added a voiceover and suddenly all the audio disappeared.
it still shows up visibly in the Project. -- the purple bars beneath the clips, and the show audio within the clips themselves. i can see the peaks and valleys.
i can see that it's there in the little audio monitor that's visible on the screen below the Project editing. when i play back the Project, it shows green/yellow/red bars as the audio "plays" somewhere inside iMovie's little world. but it won't let me hear that audio.
the sound is still *there* somewhere.
i've tried exporting / Sharing in Quicktime, media browser, and to iDVD, but the sound doesn't show up. all the tracks are soundless.
i have, of course, looked at the audio edit inspector on a sampling of the clips, and nothing is wrong in there. the volume is up to an appropriate level, ducking isn't clicked, etc.
i'm on Snow Leopard 10.6.8, a desktop iMac Intel duo, and the like.
due to my new experiences with a zillion *other* buggy behaviors in iMovie in the last few weeks, i have already: trashed the preferences, reinstalled iMovie, manually moved my project files out of the "iMovie Projects" folder and i only drag one back in when i am actively working on it (so iMovie doesn't try to have all the movies in memory at once... yes, this is a real thing! look it up. i couldn't believe it.), run disk first aid, backed everything up, exported using every possible setting i can find and basically executed every maneuver you can find on Apple Support and about 5 other websites. i have probably tried everything except flinging the entire thing out the window, which is on my list.
any help would be appreciated.

i think it is just a bug, like so many other behaviors in this application. (someone in another thread suggested they just left this iMovie version to be horrible, didn't bother addressing any of our concerns even when discussed here, because they want us all to buy FinalCut!) i think i had to start over. :-(

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