Missing audio in clips

I've imported hours of DV footage from a DV camcorder. I'm just now noticing that half of my clips have no audio. I never had this problem with iMovie 11.
When copied into the timeline, many of the clips don't show an audio waveform. The inspector only shows "video," and no "audio" information. The original clip in the event viewer also does not play back any audio. The weird thing is, when I browse to view the clip in the Finder, then play it back using QuickTime Player, the audio plays just fine. The original MOV files are still intact. It just appears that FCP somehow forgot to retrieve the audio information from the clip. Am I doing something wrong?
Any way to restore this mess?
Thanks.

I solved the problem simply by re-adding the clips back into the project. The audio now appears correctly for all the clips. Why it was missing in the first place is still a mystery.

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