I'm having trouble in my 2.1 / 2.1.2 blogs getting changes to stick in several areas. Most times the fields clear when I try to update/save changes, and I get the message: "Are you sure you want to navigate away from this page?"
This happens with adding users, adding categories, writing posts. It does not happen 100% of the time, but most often. I've tried with FF, IE6, and IE7 with similar results. Don't have this problem with my 2.0.4 blogs.