Last week this plugin started causing my post editing function to work improperly. When in "Visual" mode, I see nothing in the body of the post; just blank white space. I can see the code in "HTML" mode, but none of my editing changes take effect. Then once I'm in HTML mode and try to switch back to Visual, I can't even get back to it. None of the editing buttons show up across the top of the editing area either. Once the plugin is deactivated, though, all editing functions come back fine.
It also kicks me out of my site at random times as I'm switching pages, forcing me to log back in. That gets pretty annoying.