OS X proxy not working, Firefox Proxy working

Strange situation here, it started after I upgraded from my PB to a MBP.
The proxy settings in Network Prefs seem to have no effect except to make my system stop working properly. In short...
Setting up the proxy in Firefox works.
Telnet to the proxy:port works from a terminal window.
Setting up the proxy in OS X network prefs, the proxy never sees the traffic and Safari can't open a page.
Any dieas

Hiya,
Ok, I have the same problem. Firefox works but no apple software does with the exact same proxy settings in Network panel. Uh, Quicktime, Safari, Software Update, iTunes, including ssh and ftp from command line, etc. all fail to connect, but Firefox does.
On the exact same network, my powerbook running 10.3.9 connects just fine with all software (including ssh and ftp from command line).
The problem I'm having is on a g5 powermac running 10.4.6
Has anyone resolved this? Oh! and I'm not needing authentication either, so authoxy doesn't seem to help.
12 powerbook g4   Mac OS X (10.3.9)  

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