a change was made in 5.0.5 and later versions to improve security and prevent clickjacking issues, this is what you're running into.
to implement this change, we set X-FRAME-OPTIONS=SAMEORIGIN in the header for all cherrypy served pages. this means that you can only iframe in pages coming from the same site.
we added a new web.conf setting: x_frame_options_sameorigin = [True | False] which defaults to True.
if you set this to False, your iframing will work again.
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