Fix the wpmu_dev-image_lightbox on this site

If for example you go to this issue https://premium.wpmudev.org/forums/topic/provide-better-marketpress-statistics and try to open the image in a lightbox, you can't see a thing!! And I've noticed this in general with tall images.
So please consider adding something like this in your css....
wpmu_dev-image_lightbox img{max-height: 100%;}