We are using SBS 2003. If we create a shared folder on a workstation and give "Full Control" to "Everyone" and then try to copy files to it from the server, it eventually times out with "inaccessible" / "access denied" message. The files copy over to the share up to that point. We have to reboot the workstation to gain access to the share again from the server. The share is on a Windows 7 PC.
Sorry- I do not have the exact error message at the server.