The spell checker sometimes causes a server error, and does not seem to correctly add to the dictionary.
Steps to replicate:
1) In a CuteEditor window, delete all the text present and replace it with "bork bork bork"
2) Run the spell checker.
3) The first time "bork" shows up, click Add.
4) Then, the second "bork" shows up in the spell checker - it was not properly added.
5) Click Add again.
6) Witness a server error, likely from trying to re-add the same key to the dictionary.