Ok don't panic. That's my job.
I've made some changes to the site default's main stylesheet. This should make content easier on the eye, particularly walls of text. They should actually be readable now.
I've checked the changes in FF and Chrome on W7 and Nix, and in Webkit, Opera and FF on Mac. As far as I can tell, they're all pretty good. If you find something that seems borked to you, by all means go ahead and report it, BUT,
this is the important bit
please include enough information to diagnose the problem.