Pop ups not working

I have several existing storyline courses on my LMS that have been active for 2 years. Just recently (last 3 weeks) some of these courses have experienced "Continue" buttons not working on pop ups for knowledge checks and to resume course. Since these courses have worked for 2 years and we did not update any files, I feel this is a desktop issue or a Window Update issue that messed with the pop up blocker setting.

Using incognito window, different browsers, and changing pop up blocker setting has not fixed the issue. 

Anyone else recently experience this issue?