Mac / Windows Filesharing

Hello all.

I am having a serious issue.
We have a mac here in the office that shares some files on our network to 3 or 4 PCs (mostly spreadsheets). The mac is on 10.6.4 and the PCs all run XP Pro.

All of a sudden (possibly when the user did the 10.6.4 update) there are problems popping up.

At first, all shared files disappeared, so I repaired permissions on the mac, turned sharing off and then back on. All seemed to be well.
However, users could open a spreadsheet, make changes and save it,... but only once. After that they could open it, but got error when trying to save anything.

I went in and removed all shared folders from the list, then re-shared the necessary ones. I have tried this using both the Finder and system preferences method.

Now, I can see the shared folder, but can't open it at all as I get an access denied error.

I have tried created a sharing-only user and mapping to the shared folder from the PCs using those credentials, but with the same result. I have also tried this with the Mac being both joined to and not joined to the windows domain.

I can see, open, edit and save fine from the other Macs here.

And yes, the permissions are set correctly, SMB sharing is turned on Etc,...

Any suggestions?

I just did some testing with my Mac - I have 10.6.4
I can mount xp pro shares copy files, edit and save multiple times.
From xp pro - same thing - copy files, edit and save multiple times.
I have the same logon across all machines.

I am saying I think you can rule out 10.6.4 update as the only cause as everything works as it should for me.

I don't have a domain controller local on my network but I do VPN to get domain services from my work.

Then there is this thread
[Solved] Windows 7 and Samba Issue - windows-7
Which really gets into the nitty gritty - hopefully it is something else.