Thanks Brian. The two workstations with this confirmed problem are running Windows 7, one has Excel 2007 and the other has 2010. Our server is Win 2008 R2 Standard. The XP workstation (it's a virtual machine), is only for running Virtual Vendor Manager, we don't run any of the Adagio modules from it. We would upgrade the VM, but it sounds like quite an undertaking from what Peter has told us.

I agree that the oplocks situation is not ideal, but I'm surprised it would cause those kind of failures.