It is most obvious on bolded lower-case 'a' where the center of the 'a' gets filled in.
![Image](http://i.imgur.com/2rRsE6o.png)
Maybe it's always been this way and I'm just hallucinating, but as soon as the TB 52 update happened while I was in middle using TB this morning and it restarted the fonts just looked a little more jagged / rough / smudged to me?