This also happens to me periodically. And, while I agree that the "broken" bookmark can be repaired by deleting it and then drag/dropping a new bookmark from the target, I would prefer not to have to do this over and over. The whole reason I use the bookmarks (and I have many) is because the targets are spread across many file-shares and often very deep directory paths. It is a royal pain in the *** to have to recreate these bookmarks periodically. Is there no understanding as to why these bookmarks lose their targets in the first place?