I swear I didn't upgrade anything but I went to leave a comment and I couldn't. So I disabled YARPP and I could again. I then went looking in the FAQ and noted the fix, but I had that box (which has been relabeled by DISQUS) checked and still do. I can either have comments with DISQUS or related posts.
I checked that it wasn't Digg Digg plugin. It is your plugin but I'd rather have working comments then related posts... I had both briefly but once again it appears cross-mojonation has done me in.