I have synced my Zotero library on one computer, together with a file sync to a WebDav location. Now, when I downsync the metadata on another computer (without enabling file sharing), I get to see the icons for all the files that I attached to the item on my original computer. Clicking such a item, results in (no surprise there) a dialog "File not Found", which allows me to locate the file or just acknowledge the error. The problem is that when I close this dialog box via the corner-"X", I still get the explorer dialog window which you get if I would have clicked on "Locate...". Obviously, after closing the window this way that dialog shouldn't appear.