I have the same problem in a DFS volume (network files connected over SMB) and then replicated to another server. It seems that this occurs randomly. Windows machines can interact with the files fine, but on the OSX machines that i have tried, they all say something like "the operation can't be completed because the item "item name" is in use.".
After a few days, the error will go away and osx users will be able to acces the files.
These are random files or folders. Well random in that i havent found a correlation. Also the folders are all full control for the group that the osx user is in and i have also taken ownership by that user.
i am just looking around everywhere for solutions that have to do with grayed or ghosted out network files and happened upon this. I guess there is no solution here.