Changed the following code within /lib/editor/htmlarea/popups/fullscreen.php

// load same scripts that were present in the opener page
var scripts = opener.document.getElementsByTagName("script");
var head = document.getElementsByTagName("head")[0];
for (var i = 0; i < scripts.length; ++i) {
var script = scripts[i];
if (typeof script.src != "undefined" && /\S/.test(script.src)) {
// document.write("<scr" + "ipt type=" + "\"script/javascript\"");
// document.write(" src=\"../" + script.src + "\"></scr" + "ipt>");
var new_script = document.createElement("script");
//if (/^https?:/i.test(script.src)) { //new_script.src = script.src; //} else { new_script.src = "../" + script.src; //}
head.appendChild(new_script);
}
}

Seems the fault is with the test if its HTTPS

Works now and also works using HTTP as well

<script type="text/javascript" src="<?php print $CFG->wwwroot."/lib/overlib.js" ?>" charset="utf-8"></script>

The problem occurs on my new site (hosted by a MP) when using IE7 or Maxthon browser, but the problem does not and has never occurred on my original site (now my test site), on a different hosted server.

Both sites are being accessed from the same computer, using the same browser, running the same Moodle version, and both sites have the same modules, themes, etc. Editor enlarges fine on both sites when using Fire fox.

The only difference I can find between the two sites in regards to the editor, is that the test site does not have aspell installed, and the new site does. Disabling spell check on the new site did not have an effect, though.

There is an error reported in IE:

Line: 1130
Char: 13
Error: 'HTMLArea.l18N.msg' is null or not an object
Code: 0
URL: http://<server-name>/lib/editor/htmlarea/popups/fullscreen.php?id=312