Bummer. I've got about 250 folders with this problem.
Guess I could export them and then reimport, although I've done a lot of moving around and multilinking that will be a pain to recreate. Probably easier to retype.
btw, did the bug just apply to folder names or were the titles of the documents not keyworded as well? It is a little difficult to tell if the titles of the docs were keyworded since often the title of the documents is also contained in the text of the document, and the text of the documents I imported was keyworded.