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This first started because I was trying to empty the trash and the Mac asked me if I wanted to "permently delete" the files, but nothing else was working because I never saw this dialouge box.

I have a NAS drive and a Windows machine that both show up in the Finder's 'Shared' section.
However, if I click on them, Finder says "Connection Failed".
Clicking on 'Connect As...' gives an error dialog that says "The server 'blah' may not exist or it is unavailable at this time." Points of interest: It obviously seems to be a name resolution error, but I can't figure out why.
The only thing that has changed since it used to work is that I got a new router that now gives out DHCP (all machines are dhcp clients) addresses of 192.168.x.x, but used to be 10.0.x.x.
So, I tried to open finder preferences for something else and I never saw it.
Sometimes I'm looking at the wrong desktop, so I thought that was it.I looked at mission control and didn't see it in any of the desktops, so I was scrolling through the desktops and I could BRIEFLY see the finder window when I was scrolling, but then it'd disappear! I have an i Mac with the latest version of Snow Leopard on it.I've grep'd through everything that might have saved that old address, but can't find anything.It's also worth noting that the second Mac (the one that connects successfully) was added to the network after the router change.Please let me know if there are additional points of information needed to troubleshoot this further.