[X4U] Leopard Client Permissions Problems on Server?

[Joe Sporleder]

We are a small publishing co that opens and saves our production files  
(Multi-Ad Creator for ad design, as well as Photoshop files (CS3.3,  
CS4, and Acrobat Pro (8.x and 9.x) to a MacOS X Server. Since  
upgrading our clients to Leopard, we've started having some of our  
files occasionally developing corrupt/wrong permissions. Instead of  
the User and Group owners that our setup to access those share points,  
becomes user of "unknown" and group of "unknown". The result is that  
the file behaves as if it is busy, we can either save, but are asked  
to replace the file, even though it is a simple save, or we can't even  
save at all, we have to duplicate or save as and give the file a  
different name.

We are running a MacOS X Server 10.4.11 running on a G5 tower and also  
MacOS X Server 10.5.8 running on another G5 tower.  Both the Tiger  
Server and the Leopard Server are having these saving problems with  
the unknown permissions.

The common denominator is Leopard Client, as the 2 Macs still running  
Tiger Client are not having these save problems.

Anyone know of a fix for this problem, or have experienced it  
themselves?

Joe