Your mashup is not loading in the UI even though everything appears to be set correctly. You check the browser console and notice an error message: Refused to display 'http://insert-your-url-here.com' in a frame because it set 'X-Frame-Options' to 'deny'.
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For a page to be rendered within a frame, it has to have the X-Frame-Options parameter set accordingly. e.g. If your source page was configured with the parameter 'Deny' it will never render in any frame.
There are three possible options for the X-Frame-Options:
X-Frame-Options: ALLOW-FROM https://example.com/
The compatibility of the parameters vary depending on the browser / system where your page is trying to be rendered.
The page which you want to be displayed within the mashup frame has to have the correct parameter configured for the X-Frame-Options. You must check with the developer of the source page.
Mashup; Display; Frame; X-Frame-Options; Deny; HTML; , KBA , AP-RC-GEN-MSH , Mashups , Problem