I have a directory mounted via smbfs. I can create a subdirectory with thunar, however I cannot remove any directories. If I try to remove the directory from the terminal, then I get an error message 'device or resource busy'. If I then change to a parent directory in Thunar, the error message will be the same. It seems to be connected with the location bar on the top: If I change to a completely different directory (where the directory to be removed is no longer in the location bar), then I can remove the directory from the terminal.

Of course the bug I just described occurs only on the smbfs mounted directory.