File permission issues when sharing project

Hi,
We are sharing a project amongst two developers that each have an account on a (Windows 7) machine. They are part of a windows group and don't develop at the same time. All directories and files are in the group and are set to inherit permissions. After one user develops using Labview, all the files that he saved when using Labview have the group permission removed and the second developer can no longer open the files. Our sys admins claim Labview is somehow changing the permissions. Has anyone seen/overcome this?
Thanks,
Steve

Where is the file being saved?
No place special. We have a labview project/ directory under our own directory under C:/ that roots all the Labview project files.
If both users have full access to the directory where the files are being saved, there shouldn't be any problems. I'm sure LabVIEW isn't doing anything to change access rights.
Both users have full access. If I create a new file it has the correct permissions (a local group).
I'm concerned about the comment "part of a windows group"? Most PC's in a corporate environment are part of an actual network domain, and don't use that poorman's excuse for network access rights of a workgroup that Windows seems to want to use for standalone PC's and those not registered onto a network.
I wouldn't be too concerned =) We have a nationwide federated domain. The "group" is a local group on the computer for two people specifically to share this labview project.
Steve

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