Drives not mapping using Group policy preferences

I am trying to get a shared drive mapped for everyone in the domain using Group policy preferences. I am moving away from using a logon script to accomplish this. The client computers are XP SP3 with the CSE updates installed, and the domain controller is server 2008. I can get the drive to map for my user account but not for anyone else. I am a domain admin. The shared drive is a users drive where each user has a personal folder underneath the share. The permissions for the shared drive allow full control for share permissions and domain users have read, traverse, and list folder level permissions. Each folder under the share has individual rights for each user that allows them access. The policy action is set to replace, the drive letter is set to Use: U, and Hide/Show is set to show this drive. What am I missing that would cause this not to map for everyone else?
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Check the Run in logged-on user's security context box on the Common tab.
knada242Author Commented:
My fault I failed to mention that I had that check already.
knada242Author Commented:
should I target it to the domain users group?
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Do any useful errors appear in the Application log on workstations?

Also try running the Group Policy Results wizard for an ordinary user in GPMC and see if anything helpful shows up on the Policy Events tab.
knada242Author Commented:
I did just find an error in the app logs.

Event Type:      Warning
Event Source:      Group Policy Drive Maps
Event Category:      Disk
Event ID:      4098
Date:            4/14/2010
Time:            11:13:56 AM
User:            NT AUTHORITY\SYSTEM
Computer:      CCOX01
The user 'U:' preference item in the 'Default Domain Policy {31B2F340-016D-11D2-945F-00C04FB984F9}' Group Policy object did not apply because it failed with error code '0x80070005 Access is denied.' This error was suppressed.

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[q]should I target it to the domain users group?[/q]

No, target the domain computer group.
knada242Author Commented:
The domain computers group? This is a user configuration preference. Please explain.
knada242Author Commented:
I created a test user doamin account and gave it all the rights that my user account has, placeed it in my OU, and made it a local admin on my workstation. It still doesn't get  mapped. The only time I get the event posted above is if I select: Run in logged-on user's security context (user policy option).
knada242Author Commented:
I found the issue. A previous admin had been working on a few projects before leaving the company. One of these projects involved setting a users home path in their domain profile. This was set to U and to a server that no longer existed. My account did not have this setting, and as soon as I began to set everyone to use the local path it began to map.

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