Problem solved! Why I never figured this out is beyond me (yeah, right), but for for them wot cares, this came from my post at the Apple Discussion Board:
1. From the Apple menu, select System Preferences
2. Click the QuickTime icon
3. Go to the advanced tab
4. From the Transport Setup list, select Custom...
5. From the Transport Protocol list, select HTTP
And all is again at peace in Pendragonland.
