IE11 video issues on surface?

Hey Tribe,

I recently got a surface pro and immediately put 8.1 Preview on it. For the first couple days, all videos from all sites were working perfectly. Now, though, certain sites (including The Verge and Polygon) will perpetually buffer all videos only in IE11. This is true for both the desktop and modern/metro versions of IE. YouTube works fine. Chrome works fine for all videos, but looks super ugly at 200% scaling.

Anyone else experiencing a similar set of issues? I did lots of googling and gained little traction.