Can no longer access hidden shares on Domain File Server

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http://serverfault.com – Our workstations (Windows 7 machines) connect to users' home folders on the domain's File Server (Windows Server 2008 standard), using a UNC path like \\server\users$\... This has worked fine for a long time. Now all of a sudden several computers, but not all, can't access it. Most still work fine. It says the user doesn't have permission. The strange thing is, only the hidden shares don't work. Even stranger, using a path with a fully qualified domain name like \\server.domain.org\users$ DOES work, as does with the IP such as \\\users$. Nothing would have changed on the works (HowTos)