Stack Exchange sites that support MathJax sometimes can not handle heavy equations / a lot of symbols such as a to the power of b to the power of c etc...:
The symbols get too small. Now this is of course understandable, but, when you want to view the zoomed version (right click - zoom trigger) of an equation that use $$ (which supposed to be the bigger latex version, using $XYZ$ works fine but $$XYZ$$ does not):
And then hover / click / double-click over the equation, you see a cropped image. Note, this is actually what you see, I did not crop this image:
This is not a LaTeX bug, because I've seen many sites that support LaTeX and the zoom, for both $ and $$ works just fine.. I am using Google Chrome (I've now checked on Firefox as well - same problem)