Group Policy Redirection Not working on Vista Machines

Group policy is currently setup to redirect users My Documents/Documents folder to a folder on the Windows 2003 server. We run both XP and Vista OS. The redirection path is \\%HOMESHARE%%HOMEPATH% and it is working on all my XP machines. However, the redirection is not working on the Vista machines. Is there something that has to be done for Vista machines for redirection to work?