Jeff,
Place the card into the camera and switch it into Media mode. Do you see the icon of that missing clip? If yes, try to play it. If it plays, probably, the file is corrupted somewhere on the card – if it is the case, playback will halt at some point with the message “Media error, playback halted”.
In this case, using Expand and Divide options, you can save portions of the clip just before, and after the corrupted point. I had the same issue and managed to loose only 3 sec. of the corrupted clip…
It is important to upgrade to the latest firmware version – all kind of media errors disappeared, when I upgraded my EX-1 from v.1.11 to v. 1.20…
Good Luck!
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Thank you.