I tried that, but for some reason, whether it's the jQuery upgrade, or bootstrap, or just the layout change.. the jquery-script that helps to make the image map highlight-etc now tweaks it height down to like 1100px.. 
Don't understand why yet, but this fix sorts it for now - I could add a note to it as a TODO fix later.
Will at least make it look normal online again till I figure out why it's doing that. Thoughts?