Are you referring to a profile picture upload or a gallery picture upload?

And what have you set the resolution pixels in admin panel default 960px? or have you changed them.

I can't say for sure but it sounds like the page that is displaying the picture is too small for the actual uploaded file, so it's white or blank. Either have to make the allowed upload sizes smaller somehow, or alter the css.

Again I'm not sure what page you are referring to specifcally. And your size/layouts. This see more is just a thought.