Expanding picture

Hi all, when on laptop and I want expand a picture to full screen as on Facebook/YouTube I click on the icon in right hand corner it flashes up full screen for less than one second and minimises back again, any suggestions what is causing this? thanks for your time!!

What browser are you using? Internet Explorer, Firefox, Chrome, Safari.

It might be worthwhile downloading and trying a different browser.

Off the top of my head, without having more evidence, I would be inclined to think that your browser, for whatever reason, is having a problem dealing with javascript.

The more specific you can be, the more likely you are to find a solution.