# How do I get summations to display correctly?

On Windows 7 with Firefox 52.0 I get only the bottom half of summation symbols displayed.

As an example, I provide a small screenshot below the following link. Does anyone know what I need to do to get summations to display correctly?

Analysing an optics model in discrete and continuous forms

• It works for me. Maybe try to refresh the page and possibly clear your browser cache. Can you see other sumamtion symbols like $$\sum_{i=1}^n x^2$$ – quid Mar 9 '17 at 15:20
• Try right-clicking on one of those formulas, which brings up a little MathJax menu. Under "Math Settings" you will see a sub-menu that allows choice of "Math Renderer". Report which one you have in effect for Math.SE (the choice for Meta.Math.SE is an independent setting, as it goes site by site). I have the choice "Common HTML" in my settings for Math.SE ("HTML-CSS" for Meta), but you should try others to see if one is more satisfactory than your current one. – hardmath Mar 9 '17 at 16:15
• Changing "Math Renderer" to "Common HTML" did the trick. Others did work but I guess "Common HTML" being second from the top menu item is a good choice. I like it anyway. I would have happily accepted the answer. This is the second question I have asked, and both have been perfectly well answered in a comment. Just sayin'. Thank you hardmath (and quid). – Boz Mar 10 '17 at 1:14
• It may be the same question as this: meta.math.stackexchange.com/q/12179/442 – GEdgar Mar 15 '17 at 13:02