CKEDITOR 4.2 or later will not allow iframe (or other html tags)

Very easy fix.

Edit the config.js file (inside the CKEDITOR directory)

add

config.allowedContent = true;

before the close bracket tag.

save the change.

Edit the ewcfg11.asp (or slightly different filename depending on your version of ASPMAKER)

set this line to FALSE:

Const EW_REMOVE_XSS = False ‘ True to Remove XSS / False to skip

quit the open web browser (all open instances of that browser).

launch the browser.

retry pasting IFRAME code into SOURCE on CKEDITOR.  Should work now.