Bookmarks menu list jumps off the left edge of the screen

If you have a very long list of bookmarks under your "Bookmarks" menu,
or if some of the names of your bookmarks there are very long, the
list of bookmarks that appears when you pull down the "Bookmarks" menu
will fall partially off the left edge of your screen, so that you
can't see the full names of your bookmarks.
This problem is due to the way that Windows handles long menu item
names.  You can usually work around the problem by shortening your
list of bookmarks, either by deleting some of them, or by moving some
of them into "bookmark hierarchy" menus.