Problem using SBS VPN to access DFS drive maps.

I have a client that has a windows 2003 SBS server with SP2, setup as the DC with DNS.
Last week  I added two Windows 2003 R2 servers with DFS shares. The vpn users drive maps for the shares are \\domain\dfs_share\dfs_share. (they used to work OK)
Remote VPN  users used to only me able to access the SBS server or dfs namespace, neither the two new DFS servers can be access with UNC.
 My problem is remote users with XP machinesand Vista machines not joined to the domain use the SBS server's built in  VPN to access the businees network and DFS shares.
Drive maps with VPN worked OK for a few days and today they quit for everybody that uses VPN. There is a progress bar in everyone's XP and Vista Computer browser moving very slow.
Nothing changed on the servers and the event logs look OK.
Also one the DFS R2 servers is a Domain Controller with DNS and the other DFS R2 server a member server.
Any suggestions what may cause this?
cap7Asked:
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DTAHARLEVConnect With a Mentor Commented:
when they vpn in, do they get an IP address, a suffix, can they ping \\domain, or \\fqdn?
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