I have installed FF 4.0 on home and office PCs (both Windows XP). Bookmarks are synced between them using FF Sync 1.7. Until a couple of days ago, no problem. But now something weird has happened to the bookmarks on my home PC. All the bookmarks are there - I can select them normally from the BM toolbar and the BM menu, and they are found by the address bar. However, I can no longer organise my bookmarks. When I choose 'Show all bookmarks' the All Bookmarks folder appears completely empty. When I add a new bookmark, the Choose folder dialog shows a small, apparently random selection of my bookmark folders, and the Choose drop-down doesn't show any folders at all. I have tried restoring bookmarks from several days ago and also from the office machine. In both cases restore worked fine, but it still only populates the Bookmark menu and not the Show all/Organise folder.