Can't connect to anything on the network

Since yesterday, I'm unable to access any of the shared Macs and Servers on our network. I wasn't aware of making any changes that might have triggered this, like doing a software update.
Here are the symptoms:
In the "Network" pane, when I click on any of the shares, I get the message:
"The alias "XXXX" could not be opened because the original file cannot be found."
Also the "My Network" folder is no longer showing up in the "Network" pane.
When I try to connect using Command-K to bring up the Connect to Server window, trying to connect to any of the favourite IP addresses produces no results: I can select the address and press "connect", but nothing happens.
I am able to print, and to send and receive e-mail and connect to the Internet, and the Network Status window in System Preferences says that Ethernet is active and all is well.
Other computers on the network can see and connect to me.
Any ideas? I've tried a restart (a few of them!)

Thanks for the suggestions... in the end the only solution was to reinstall the combo update of 10.4.11. Some preference (or something) was just very unhappy - and reinstalling the combo update fixed that.

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