Browser Audio a Mystery

We're using Quicktime Pro 7.5.5 in Mac OS 10.4.11 on a G4 MDD 1.42 DP PPC.
The audio-out unit is a USB DAC that is set as the "default" and "output" unit in both the systems audio preferences and the audiio MIDI utility.
Everything is sending to the USB DAC unit, system alerts, .aif and .dv files on the desktop, everything except any of the internet browsers - Safari, Firefox, Opera.
The audio from any of the net-browsers is still being sent to the G4 audio card.
What is wrong here?
Why is Quicktime sending browser audio to the G4 sound card when all settings and defaults have the USB DAC showing as selected?
Thank you.

( update )
The issue is -
incoming mail alerts, mouse-click miscues, .dv files (Quicktime Player) on the desktop, .aiff files off firewire drives in their folders, Audio/Video applications -
all audio is successfully being fed to the USB DAC stereo unit,
EXCEPT the audio from any browser (Safari, Firefox, Opera), which is somehow "successfully" still routing to the tower's sound card.
All possible preferences for audio output selections show the USB DAC (System Audio / Audio MIDI).
Apple Technical says they "have no knowledge" and that the browser audio should be routing to the default audio device.
We've re-installed, trashed preferences, run OnyX, repaired permissions and are fast coming to the conclusion that this non-hardware issue is exactly as it appears, a OS 10.4.11 browser audio issue.

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iMovie 11 audio issues. Fine in timeline, but when rendering to iTunes or Media Browser, audio from certain portions of movie files are heard in places where it shouldn't be !
I have created a project where I have a montage of photos and video clips edited together with music under. Some audio portions of the video files are being muted in some areas and those portions are being heard in another part of the project. This is not for all video clips only certain ones.
The project plays fine in the timeline, but when I render the project thru iTunes or Media Browser, this is when the project goes corrupt.
I tried detaching the Audio from the video clips and this somewhat worked, but the original problem still exists with certain audio still being heard where it's not supposed to be.

I have a fix - or rather, a workaround.
WARNING: It is lengthy, but still far better than starting a new project from scratch.
I had this same issue and none of my transitions/clips were at custom speeds, nor did I have anything else weird going on. Unfortunately there is nothing you can do within iMovie to fix this, at least there wasn't for me. iMovie is BY FAR the buggiest software I have ever used and if you haven't already spent hours slaving away on a project, you are so much better off using just about anything else to edit your video.
...But let's assume you have already spent many hours working on your project and you don't want to start all over. Well then, you have at least one option.
It's a pain in the neck, but it's infinitely better than restarting your project from scratch.
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I know this entire process *****, but if you're that far into your project, there is little else that you can do. Now you've learned your lesson:
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