Hi,
Although the NTFS and Share permission should be correct, I still recommend confirming the result before checking Group Policy.
Here are 2 tools which can help us check permission settings. Please download ShareEnum and AccessEnum from the following links:
ShareEnum v1.6
http://technet.microsoft.com/en-us/sysinternals/bb897442.aspx
ShareEnum utility can clearly list all the Share permissions with all the groups (including global groups and local groups) on the server.
AccessEnum v1.32
http://technet.microsoft.com/en-us/sysinternals/bb897332.aspx
AccessEnum utility can clearly list all the NTFS permissions with all the groups (including global groups and local groups) on the server.
2. Copy ShareEnum and AccessEnum utility to the problematic file server.
3. ShareEnum.exe
a. Double-click ShareEnum.exe.
b. On the drop list of "ShareEnum displays security information on all shares accessible with the selected domain", select the domain that you want to list share permission.
c. Click "Refresh" button to list all the Share path and Share permission in the console.
d. Click "Export…" to save the report as a "share.txt" file.
4. AccessEnum.exe
a. Double-click AccessEnum.exe.
b. Click "Directory…", you may select the directory of that shared folder in the "Browse for folder" dialog box.
c. Click "Scan" button to enumerate all the NTFS permissions on the target directory or partition in the console.
d. After enumeration, you may click "Save" to save the report as a "NTFS.txt" file.
If possible, please send the share.txt and NTFS.txt to tfwst@microsoft.com for further analysis. Please keep the topic title and my name (Shaon) in email so that I can find it. Also please give me the name of that share folder in the mail.
If issue is not related to these settings, I will provide steps to check Group Policy.