For the past two weeks, I've been having major formatting issues with WordPress 2.3.1. Every time I edit an existing post, all my break tags, center and left tags disappear. It takes two or three edits to get it back to normal. This is happening on four different computers, and three different sites, so it's not specific to one installation. My guess is it's 2.3.1 because I have another WordPress installation at 2.1.3 and it's working fine.
It's getting really frustrating! Anyone have any similar problems? I'd rather not revert back to a previous installation if I don't have to.