Clicking some links does nothing

I have a page in a course with several links on it. When I test it online, all the links work fine for me. However, when a colleague in another office tries, some of the links work while others don't. He says that when he clicks the link, nothing happens.


I've checked the links in Lectora to confirm all are set up similarly. I don't think it's a pop-up blocker problem, as some of the windows do actually open. Also I suspect it's not a networking issue, otherwise I would have expected a 404 rather than no response.


Any ideas?

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