iframe no longer appearing on desktop site

We've had a site up for a long time that would display the content in an iframe. After installing mobile, the iframe no longer appears with the page on the desktop version. On the mobile side you can get to the page by clicking through nested page links but on the desktop, even when you click a sub-link that should change the iframe content, that link takes you to another page, completely irrelevant to the intended content.

From what I can tell, the affected pages haven't had any changes to their code. Is there a configuration somewhere to restore the old behavior.

Just noticed, when I look at the source now through a web browser, the iframe shows up but commented out. The actually page itself though still shows up without comments. So I need to a way to prevent the code from being automatically commented out.

Nevermind. Apparently a coworker was working on the site without my knowledge. They changed some code at the same time I installed. Holy crap that freaked me out.