Thanks for this topic. It helped me solve the problem I was having on SSL pages.
The problem is that there are some iframes with the src attribute not set. (Note that this is only a concern for ie, not firefox.) Since the src has to be set to SOMETHING, I created an empty html file called index.html and put it in the webwizeditor directory. There are two files which I changed to fix this problem. They are
1) RTE_javascript.asp. To fix problem I added the line
iframe.setAttribute('src', index.html');
after the line
iframe.setAttribute('id', 'WebWizRTE');
2) RTE_popup_word_paste.asp. To fix the problem I changed
iframe id=''pasteWin'' width=''100%'' height=''180px'' style=''border: #A5ACB2 1px solid;backgroundColor: #FFFFFF;''>
to
iframe src=''index.html'' id=''pasteWin'' width=''100%'' height=''180px'' style=''border: #A5ACB2 1px solid;backgroundColor: #FFFFFF;''>
There may be other places in the code where you need to give a src attribute to iframes, but I haven't found any.