I installed Twitter Tools this past week and set it to do a weekly digest at 9:00 am Saturday morning. I had several days' worth of tweets since installing it, and they all appear in the sidebar with no problems. But for some reason, the only tweet in my weekly digest was the tweet I'd sent out that morning (this morning, as I write this). None of the tweets from earlier in the week appeared, and I had the oldest-first / chronological order set, so it should have been last in a list of tweets.
Any ideas? I'd point you toward it, but I set the post to draft so as not to be ridiculous-looking as the most recent post on the blog.