Don't know if anyone's been having the same problem, or if it's just my machine: I can't move items in a course using Drag & Drop in Firefox (18.0.1) or Google Chrome. I recently upgraded Java. We have Moodle 2.3.1 on production site and 2.4 on test server, the problem's the same.
I can still rename, duplicate or delete a resource or file, or drag & drop upload a file, but I can't move them around in the course area - same goes for blocks or topics.
It does work on IE 9 (ironically) so it seems browser related or linked to the version of java - version 184.108.40.206
Has anybody else experienced this or can anybody suggest a solution for this?