WA's UI scrunched up? Alter your browser's zoom!
I like to use Chrome for editing my site, but ever since WA changed to its new format I had the problem you see in the image. The left sidebar is all scrunched into the main body! I didn't have that problem with Firefox, so I assumed it was a Chrome thing.
However, I fixed it just now by zooming out a bit in Chrome. After setting the zoom to 90%, everything fits! All fixed and wonderful again. So if you ever have that problem, there you go.