I have inherited a Mac server 10.7.3 which was put in place around Christmas. Everything with Mac clients connecting was working fine and no issues accessing files/folders. A few weeks ago 2 new Mac's with 10.7.3 were introduced into the network and since then we have started having permissions issues. There are 5 other Mac still accessing the server with either 10.5 or 10.6 as the OS. This is on a Windows network and I have not added directory lookup on the Mac server for Active Directory as it was not set up before. All user accounts on workstations are also created on the server with matching login credentials. If user A creates a file and saves it to the network share and user B attempts to open it they get access denied. Checking permissions on the file and it shows Read Only. I can apply the correct permissions and it will work. I have gone through the Server App and applied the correct permissions on the Share Point and from Finder checked the shared folder and its permissions where they display correctly. I have even applied said permissions to all containing folders.
I am a Windows person first so I think I could easily correct the issue by reapplying the permissions or setting inheritance correctly. I am new to Mac's and searching the internet has turned up little by way of resolving the issue. Any insight would be greatly appreciated.