The HTML Editor works but when I enlarge the editor I get:-
This only occurs on two of my sites that I have added some bits to (it doesn't happen with moodle.org) and always with Firefox. IE doesn't exhibit the problem all the time. When using IE and clicking on the Enlarge Editor icon but it works OK but if I copy and paste the URL for the pop-up enlarged editor into a full IE window address bar I get the same problem.
I have added various bits such as the ajax drag and drop behaviour and others that have meant I had to add code to lib/moodlelib.php and other files so I guess it's something to do with those additions. I have tried changing one or two files back to the latest stable 1.53 release but it doesn't help.
Can anyone point to wjhere this is likely to be messed up? Which files apart from the lib/editor files (which have not been changed) does the HTML editor depend on.