Running XenForo 1.1.2 Not sure when this happened. But now when you click Insert/edit Image, put in a valid URL, and then click Insert you will see it upload and process. Then it refreshes and just shows the Insert/edit Image popup again. No code is inserted into the editor. No errors show up in the server error log. You can still manually put the IMG tag in the editor and that works. It's just not working with Insert/edit Image.