Cannot delete problematic folder

I have just encountered the same problem only this time I cannot delete the folder with Path Finder as I had done before - when I do so, the folder disappears but reappears when I go back to the enclosing folder. I cannot move it or rename it. The folder has an é in the title (something it came with - I avoid accents etc. in file names) and suspect that this might be a cause of the problem. I tried several Terminal commands that I found on this forum and on the Apple Communities site but all of them came back saying that the file does not exist.

It all started, I suppose, when I tried to copy the folder from the share on my ReadyNAS Duo to my Mac HD and got an error. After several attempts, I decided that there was something wrong with the folder and tried to delete it. As far as I can tell, using Path Finder there are no invisible files in the folder but on the ReadyNAS share it says it is 5.8MB in size, though the 5.8MB is greyed out.

Every time I try to delete it I get an -8072 error and then I have to restart the Finder in order to unmount the ReadyNAS share.

I'd be extremely grateful for any advice which might help me get rid of this nuisance folder.

[edit] I forgot to mention that the folder does not appear in Mac Open/Save dialogue boxes - only Finder windows and certain applications like Path Finder.