I'm not quite sure what is going on here. I use the latest Google Chrome, and recently Alert Box popups are not showing. They are THERE because I need to press enter / esc in order to use my browser again. This is for all warning boxes in the browser. I tried plugging in an HDMI cable to see if it was really turned off, and maybe I could see it if I had expanded the monitor, but to no avail.
I saw that in 2012 there was an error that was similar to this, but it was obviously fixed and should not be relevant here.
EDIT: Version 39.0.2171.95
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