Captivate 4 - audio editing issue (distortion heard once published)

Hi -- I am working on a 17 minute movie with audio on each page (total project size about 60mb).  I recorded the audio outside of Captivate and imported the .wav files (for some reason the .mp3s sounded too tinny).  When I started the project in November I had no problem editing the files (removing sighs/pauses, inserting silences) and adding to the slides. 
For some reason in December I started running into issues.  I would go to edit a sound file on a slide, it sounded good when played back, but when I previewed or published the sound file I just edited it would have a layer of sound on top of it making it distorted.  Also, I no longer have the ability to add silence at the beginning and end of the audio file (which I was able to do in November).  I add it in edit mode, can see/hear the pause but when I save and close out those beginning and end silences disappear.
I just got final feedback and was making adjustments on two slides but the same thing happened.  The audio files I edited would sound distorted when played back in swf form.  The only way to save the project was for me to open an old archived version, export that audio, re-import to my production project and it worked fine.  But I cannot edit it in Captivate.  If I do, the distortion gets added.
I am publishing as audio quality: MP3, 96kpbs, 44.10 KHz.
Any thoughts?  I like to edit directly in Captivate and don't want to have to do the extra step of editing the audio in another application.
Thanks!

Hi there
If you want to add silence at either end, your first step will need to be to position the playhead ever so slightly away from the true end or beginning. Otherwise, Captivate ever so helpfully discards the silence. So the silence needs to be inserted between the ambient noise.
Actually, this is a nice segue into a technique you may wish to use. Select a section of the ambient noise and paste it repeatedly. This will eliminate the "dead air" you hear with total silence. Sometimes inserting silence is one of those - "the cure is worse than the disease" sort of things.
Cheers... Rick
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