It's refusing to add some words to the dictionary - a lot of what I do involves place names and it's v useful to have them added for future fat-fingered episodes.
Yesterday it would happily add anything - today it's being very selective and will hardly add anything (ie in the drop-down box of suggestions etc, the "add to dictionary" link isn't working)
The weirdest thing is that I have one word (well, an abbreviation) in 2 places - one does get the "add" link and one doesn't