If this happened to _ANY_ map, I'd suggest that it is an Adobe Flash issue for which you should completely uinstall Flash and then go to Adobe.Com and obtain the latest Flash.
However, if it is only happening in Ohio, it may have been a transcient problem with RR that was specific to the Ohio map. However, the Ohio map is currently working for me just fine.
So if it is still not displaying properly for you, I would consider clearing out all your temporary internet files, closing the browser, re-opening it, and revisiting the Ohio map to see if you can see it again.
Many years ago I switched to Mozilla Firefox Mozilla.org - Home of the Mozilla Project. This is the browser I advise my customers to switch to when Internet Explorer keeps giving them a really hard way to go.