A post at the thread below fixed things for me. Apparently a WordPress function was renamed, breaking it. One quick edit, and things started to work.
http://ww.wp.xz.cn/support/topic/56700?replies=9
I’ve had similar issues with the rich-text editor. Great idea, and when it works, it’s wonderful–but it rarely works for me, so I just disabled it. Currently, the thing annoying me most is that there’s no way to put in a single line break with it; it always “skips” a line, double spacing it. Dunno.
