My Opera 9, which I just recently got, messes up my bookmark's icons. You know when your bookmarks are listed in the menu and they have their icons? (For example, Geeks to Go's icon is the little redish "g" on the left.) Sometimes, Opera changes some of my site's icons with another site in my bookmark's icon.
Like.. myspace.com's icon will change atlantafalcon.com's icon. It usually happens when one site's icon replaces a site WITHOUT an icon.