Attached is screen shot of Whitebear Status tab. Others to follow.
Ok. I see from the Whitebear status tab that you have two Squeeze players and one library "Jac's Library". So let us do a few tests:
Test #1: Test the UPnP Discovery processWhen you start MC it will scan the network looking for UPnP devices, and after about one to two minutes, any such devices will show in MC's Now Playing list. You should see your two players "Name (by Whitebear)" and also the library "Jac's Library (by Whitebear)". See attached screenshot from my own installation. => Please let me know what you see.
Test #2: Test network connection & server stabilityOver a period of (say) 30 minutes, do the above "Name (by Whitebear)" devices remain solid in MC, or do they come and go?
Test #3: Test the UPnP Description processAssuming you are running Windows 7, 8 or Vista. On the machine where MC is running, open Windows Explorer | Network. Do the above "Name (by Whitebear)" devices appear under Media Devices? If so, then right click one of them and select Properties. => What do you see? Also right click and select View Device Web Page (something like that). => What do you see?