Initially I had 5 keyboards
English Spanish Emoji Japanese (Ten Key) Japanese (Romaji)
I added a couple words to my User Dictionary. Later I realized that I do not use the two Japanese ones very much, so I removed them. After doing that, the "Edit User Dictionary..." option completely disappeared from my Keyboard Settings menu. When I put Japanese (Romaji) back on, the option reappears.
I tried deleting the few words I had entered and removing the unwanted keyboard again, still the option does not appear. I am thinking the dictionary database may have been built to correspond only with the keyboards I had when I initially edited the dictionary, and now it won't rebuild or something.
Anyone else seen this?