Vista - Offline Files "Access Denied"

We have Corporate laptops machines with Vista Enterprice edition and we use Offline Files. All laptops are in the domain and have a GPO to enable and encypt the offline files. After the SP1, now we receive the "Access Denied Error" at all Vista laptops, no issues to other Windows versions.
Here are some of the workarounds we all ready did without luck;
1.Change from the OU one of the laptops, disable the Offline Files, reboot, and enable offline files againg.
2.Change the security for the \\fileservername\share\userfolder folder to Everyone Full Control.
3.Enable the opportunistic locking at the server.
4.Reset and Delete the "C:\Windows\CSC" folder
5.On laptop we add the registry key; [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRXSmb\Parameters] "OplocksDisabled"=dword:00000000
6.On the File Server we add the registry key; [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters] "EnableOplocks"=dword:00000001
7.Check for changes on the current GPO and not changes have been made after March 2008.
8.Remove and move againg the laptop to the OU an verified that they receive the GPO policies from the domain and they apply just fine. GPO Details are;
List of applicable Group Policy objects:
-OS Settings - Screen Saver Timeout
-Software Settings - Corporate Office 2007 Default Doc Extension
-Software Settings - Corporate Blocked Content
-Software Settings - Global IE Settings
-OS Settings - CA Certificate Enrollment
Default Domain Policy
-Desktop Settings-SDC Laptop Users Screensaver settings
-Desktop Settings - Folder Redirection and Std. Mappings
-IT Homepage.
9.At Changes to an offline file are not saved to the server when files are synchronized in Windows Vista mentions to install a hotfix but the files versions that mentions (Kernel32.dll and Cscsvc.dll) are more new on the laptop now than the ones the KB says.
10.After the sync we receive the access denied error no matter on were OU is in the laptop.
Without Offline Files enable the users can successfully use their data via UNC or Mappings. They can change, rename, deleting, etc... Then, after enabling the offline files again and when doing the sync we receive the access denied error again on must of the files.