I'd like to stress this problem didn't start for me with 2.4 I encountered it with the previous version, but because I hadn't had reason to make any changes, I hadn't visited that page since before updating to WP 3.6.
Simply stated, those buttons which I used to be able to drag and drop, won't budge. I've tried 4 different browsers and the results are the same. Any suggestions?
One problem I had with the previous JP version has been fixed in 2.4. The comment function works again. :-)