At work our macs are connected to the company's sms share. When I drag some folders from my mac desktop to that share, sometimes I can't rename that folder. It's not a mac error, since I tried it on a windows machine and the folder(s) can't be rename or moved to another location there too. On the windows machine it says the folder or files in it are in use. But only I used that folder when I dragged it to the smb share No other person has the folder open or files inside it opened. This doesn't happen with all folders.

What could cause this 'bug'? Is it a mac thing (snow leopard) or something the guys at Support should change on the smb share?