Streamed events don't work: Timed Out message

Question

I know I've posted a message here on this subject, so please forgive me.
The problem I've got is that my admin account can't successfully see any of the Apple webcasts. Quicktime launches and goes through a negotiation process but then just times out. Changing the streaming protocol to HTTP80 doesn't work, when this is selected I simply get "connection failed".
The odd thing is that a standard user account that I'd previously set up on the computer works like a charm, no problems at all. So, what's up do you think?
The even odder thing is, if I now add another user account to the machine then the behaviours of the new account match that of my main admin account. ie, Quicktime webcasts don't work.
I've tried the deleting the webplugin but that has had little or no positive effect.
Any advice is very welcome, short of re-installing my system (which I'm almost tempted to do!!)
Best regards

Answer 1

*A few suggestions:*
Repair permissions & restart your computer.
Check your QT MIME Settings.
System Preferences>Quicktime>Advanced
Click on the MIME Settings button.
In the next window that opens up make sure that Streaming-Streaming movies is enabled (checked).
While you’re at it make sure all the boxes are enabled by clicking on the corresponding triangles so that they are pointed down.
This will show the “hidden” boxes especially the Video box. This box will enable you to play .avi files.
Click the OK button.
Now click Streaming
Your settings you should be (as starters):
Streaming Speed: Automatic
Make sure Enable Instant-On is enabled (checked).
Now click on Browser
Make sure:
Play movies automatically
Save movies in disk cache
Are both enabled.
Movie download Cache Size: Slider set all the way to the left.
Restart your computer.
Consider updating your OS to the last & latest Tiger version - 10.4.11 along with all other updates that goes with it from the Software Update control panel.