How / Why is audio being truncated

Basic Problem: All the audio on imported video clips is being cut off after approximately 7 secs.
Description:
I have a set of clips that were made on a Nikon Coolpix. They were imported firstly into iMovie where they played correctly. Then I imported the same clips into PRE.
I moved a couple of clips onto the timeline where they appeared to play correctly.
I started experimenting with a narration track, the narration coming from a USB mic.
I now find that the audio on the video tracks is truncated after about 7 secs, in other words the sound starts playing and then stops at about the 7 sec mark.
If I detach the audio from the video and look at the waveform you can see the first 7 secs as an expected sound waveform and then the display changes to a rectangular box with no sound waves. I tried to capture an image of the waveform, or lack of it but it appears that the waveform view is on the same level as the screen capture process so I can't capture the image.
All of the clips seem to be suffering from this problem suggesting that I must have changed something at the macro level to create this problem but I'm at a loss to know what would effect it.
I'd appreciate any pointers as to what might be the source of the problem and how I might correct it.
Thanks.
Background:
OS X 10.5.8
PRE 9.0.1

@ Bill Hunt
Hi Bill:
Thanks for the feedback.
After some trials I believe the "conforming audio" is not the problem (or maybe it is and I don' understand it). After importing a clip there is no indication that there is any processing going on - also there is a small 'P' in the lower right hand for the thumbnail. I can't find any explanation of what the letter 'P' means.
I removed all the offending clips and tried reimporting them but still ran into the same problem, even tried importing and letting it sit for an hour to make sure there was no processing going on that I couldn't detect - overkill I know. Didn't solve the problem.
I tried cleaning up the media cache via the preferences menu, after I deleted the offending files. Then reimported but to no avail.
I erased the project and all related files and repeated the whole process but still would not work.
What did work
I tried importing an older file from a different event, also a file from the Nikon, and found that it suffered the same problem.
So I converted the file to mpeg4, imported the converted file and it worked perfectly - the quality of the video appears somewhat degraded but the audio is complete.
I repeated this with a different process. Made the clip into a project in iMovie, exported it and then imported that file into PRE. It worked just fine.
Now I notice that sometimes when I import a file that come from the Nikon PRE asks me if I want to fix the quality.
So, in my naivety I'm guessing that this problem has something to do with the quality of the clip. I don't know much about these things but I understand that the extension mov could mask a variety of formats and so perhaps there is something that PRE can't digest very well in the file exported from the Nikon.
Thanks for the reference links, very much appreciated.

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