Imac no longer "sees" shared non-Mac devices on network

Hi everyone,
Here's a real puzzler (for me anyway). I have three Macs, two PCs and an Escient digital jukebox on the home network over standard router-based ethernet connections. The system has worked great especially since Leopard came out and automatically detected the non-Mac devices and added them to the shared category on Finder. Suddenly in the last couple of days I noticed that although the Mac devices are still on the shared network, the PC hard drives and the Escient jukebox has mysteriously disappeared. All of the devices work properly, and I have made no changes in my network recently.
Any thoughts on diagnosing the lost shared devices and restoring them? I tried Time Machine, but it acted also as if those devices never existed. Thanks for your help!

Hmm yes.. this is a strange one.
You could try this as it appears to work with a couple of tests I ran.
Open your Network Preferences pane from  > System Preferences.
Make a new location.
For which ever interface you are using, be it Wired (Built In Ethernet) or Wireless (AirPort), click the "Advanced" Button. Click on "WINS" and enter the workgroup name of your other Windows Devices (Default is usually WORKGROUP) into the Workgroup drop down menu.
You can also use the menu to see if your mac can see any other workgroups.
Click OK, Click apply and see if it worked.

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