[inciarco]

I Think That The Problem Is In The Code Included in the File "iepngfix" (HTC File), because that File Includes a Code with some Conditionals somehow similar to the Previously Described!!

I Also Found the Text "I++" in some of the Code Lines in the Scripts "interface" and "jquery", so could be them too the ones causing Those Problems with the Editors!!

You Should Check Also the Plugin "Ajax Fisheye Menu headinclude Auto Edit", that Includes that Code in the Head Include Template!!

I've Disabled that Plugin, and then Checked the Quick Edit Functionality, and Works Ok, and also the Error Code Included in the Full Editor (Mentionen in my Previous Message) Don't Appears, so the Errors are Related with that Plugin!!

I Found One Line Similar in the Function "doFix":

for (var n = 0; n < childNodes.length; n++)
    if (childNodes[n].style) childNodes[n].style.position = 'relative';

So I guess, somehow that File "iepngfix" could be causing the Problems with the Editors!!

I Hope You Can Fix Those Bugs!!

My Best Regards!!