Here are some troubleshooting steps I would try.
Mount the share via SMB on both mac 10.4, 10.5 and Windows, and AFP as well on the macs.
Look at the permissions. Are the permissions different?
Change the permissions on the root of the share and all contents to read+write for everyone.
Can the Win clients write yet?
Do you have inherited permissions turned on?
Turn off sharing on the directory completely and share it again.
Stop samba.
Backup /etc/smb.conf and replace it with a copy of /etc/smb.conf.default
Restart samba and see what happens.
Try to replicate the issue on another system.
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