[Plugin: Wordbook] Stopped working on September 20

WordPress successfully posted to Facebook on Monday, September 20th, 2010 at 1:18 am Eastern Time. My next post was at 9:20 am Eastern Time. It did not make it through to Facebook. No posts have been successfully cross-posted since. I do not get any kind of error messages. Everything on Facebook is still configured properly. Wordbook appears to have become inoperative. I am going to delete everything and try again.