Can't rename certain files

The Problem:
I am unable to rename (via f2) certain, apparently random, files using Directory Opus, nor any copies of them. When I try to I get the following error message:

"An error occurred ... The process cannot access the file because it is being used by another process. (32)"

I get the same message when I try to move these files into another folder via drag and drop.

I can rename the same files via Windows Explorer, but Explorer wont let me move them via drag and drop either, and gives me a similar error message, so I guess the problem is probably not entirely with Directory Opus, however, perhaps someone here has run into this problem and knows of a solution.

FYI - I have no troubles with other files of the same file type.

Working Conditions:
I am having this issue in a small office environment when attempting to edit files on a server. I have brought the issue up with the guy that setup and maintains the network and server, and he has not been able to find anything in the server settings, or permissions that explains this issue.

Any help would be greatly appreciated.

What kind of server is it? Which OS does it run?

The problem has been resolved. It wasn't DO at all.