You can talk about issues with k-meleon here. Issues means: bugs, malfunction, crashes, etc. Remember that issues with web rendering is beyond the scope of what K-meleon is, a shell for an engine.
Please try to remember and tell us what you did or what added or any idea what happened?
Did you do a search for a file "bookmarks..." in your profile folder? If yes, was it there or not?
Did you install KM as portable, are your profiles inside the KM program folder, or in general windows user folder (appdata)?
Did you search for "bookmarks" in both locations, inside KM and in c...user...appdata?
Just in the last days it finally turned out that there seems some bug with portable profiles and updating the KM version, but such things like yours could sure need some user input.