CS4: Audio Lost/Blanked

Hello,
I did a few searches and didn't find a solution to my particular problem.
I am in the middle of a project that required clips for a full length video to be extracted and exported for youtube.
I started the project with 4.0.0, then when I got to the exporting stage I realized that there were updates to the program that included more presets for youtube exports.  So, I updated the program to 4.2.1.  Now all of the audio has been lost and blanked out, the waveforms replaced by a line.
The audio of the program is working fine, other files play normally.
I have a feeling that my source files, MPG video, are somehow in compatible with the program following the update.  I was only furnished with a DVD copy of the original video, as that was all that my client received from the previous editing house.  They are now out of the picture.   As such, my only option was to work with the mpg files.  Not ideal, I know, but the video/audio and my test exports were fine before the update.
Is it possible to revive or salvage the project, or will I have to start from scratch?
I am running CS4 on a Win7 system, 4GB ram, Intel i3 Core.
Thank you kindly for reading and replying.

IIRC, CS4 was updated to 4.3. I would update to that.
Then, is sounds like the link has been possibly lost to the CFA and PEK files, which are created, in the Conforming process at Import.
First thing that I would do is to look in the Media Cache (located by Scratch Disks), for that Project and see if you have CFA and PEK files with names matching your Assets.
If you do, then you might try the Match Frame, which in CS3, CS4 & CS5, the M key. What one must do is to move the CTI (Current Time Indicator w/ the red Edit Line) over the Clip, Select the Clip, and then hit the M key. If successful, the Waveform Display file (PEK) should now display your Waveform, rather than a flat-line.
If that does not work, I would create a new Bin, and then Import the MPEG's into that, allowing the full Conforming process to complete. This ARTICLE will give you some background on Conforming.
Having the Audio go flatline most often occurs with the Copy/Paste operations. I do not recall hearing of it with just an update, but might have missed it.
Good luck, and please report your success,
Hunt

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