The response from Blogger Support:
Hi Robert,
Thanks for notifying us of this issue. We had a number of unplanned outages in early February, resulting in various problems in Blogger and BlogSpot, including a number of cases in which posts would be lost when users republished their blogs. The full details were posted on our status page (http://status.blogger.com) at that time, though things should be working normally now. We apologize for the problems this has caused, but please be assured that we are actively working on preventing this from happening again, and on improving the reliability of Blogger and BlogSpot. Thank you for your patience.
Sincerely,
Blogger Support
Thanks to Hayden for digging up the cached copies on Bloglines.