We have a shared drive on our network (attached to a Mac Mini acting as a pseudo-server). Recently I've started seeing insanely frustrating behavior with file self-deletion. If I select a file (named "X") and choose Command-D to duplicate it, I get a message saying "The operation cannot be completed because an item with the name "X" already exists." The only selection available is "OK." Clicking OK causes the original file "X" to disappear. It also appears that a copy of X is created and also deleted in an instant, almost too quickly to see. To make things more maddening, because it's a shared volume, the file is truly deleted immediately and cannot be easily recovered from the trash. Any idea WTF is going on?!?!?!?!