This last week while browsing this site my computer has displayed MathJaX really badly. Here is a screenshot from a random question:
Here is a screenshot of the same question from my phone for comparison (slightly blurry on my screen due to scaling):
To me that looks a lot better. I would normally search elsewhere for the answer, but StackExchange is, as far as I can tell, the only site where this font change has taken place.
I am using Chrome on a Windows 7 machine. Mozilla Firefox has the same problem, while Internet Explorer looks good. Zooming in and out doesn't help. I don't think I've touched any settings lately. Does anyone know what might cause this?
Edit: After some help from Willie Wong, here is a screenshot with the math renderer changed from HTML-CSS to SVG:
It looks a lot better, but it seems very boldfaced, like the G, H and brackets really stands out on the page.