CS5 Audio Playback Issue

I can't get an audio file to play for longer than 1 second without stopping. Don't see anything in any setting that would affect this. Any ideas?
I just installed Soundbooth CS5. I opened a mono, 9 minute mp3 file, 32000 Hz, 4.36 MB. I have tried other files of different specs with same result.
I'm on an iMac, 3.33 Ghz, 8GB running OSX 10.6.3.

I'd just like to add my experience, which I hope will be helpful.
I, too, had the problem described having downloaded and installed the Soundbooth CS5 demo. I've seen the other posts on this issue and searched, using various methods (including simply navigating to the library/preferences folder (tried both the root directory and my user directory) and I can assure you that com.apple.audio.AggregateDevices.plist was NOT present on my Mac (MacBook Pro 15" 2.66 GHz Intel Core 2 Duo / 8GB RAM running OS X 10.6.3).
Following your TechNote, I logged in as root and started Soundbooth. Everything worked ok and when I logged back in under my usual user account com.apple.audio.AggregateDevices.plist was present in my preferences directory.
It might be useful to point out in the TechNote that the second step should be taken if the com.apple.audio.AggregateDevices.plist file ISN'T PRESENT in the preferences file. I spent ages trying to locate it using Terminal, File Buddy etc. before resorting to the 'root user' solution because I'd read a note from 'durin' in one of these threads saying that, 'that file definitely exists or you wouldn't have any audio devices working at all!' This wasn't the case with me.
Steve

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http://forums.adobe.com/message/5948467#5948467
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I've wasted more than 2 days, can't see any pattern, original is H264, I've tried everything from claening caches to recoding to various formats such as mpeg and Avid MXF, all have exactly the same issues.
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I feel I am chasing a major bug that according to forums seems to have been around for at least 1 year.
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AUDIO ISSUE RESOLVED !!!!!!! (for my particular situation)
this will take a little to explain so here goes....
I've had enormous problems this past week.
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in the bin, hilight the source file and right click, go audio gain, and "set gain to" defaulted to "nan" db
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WHEW
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Rob
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