I have not had a problem until today. I can see my own DNA results in Firefox, but not my son's. Both were OK yesterday. I can see his in IE 9 though.
I just saw a new drop-down selection "has a hint" - so maybe Ancestry.com updating their software is causing the outages.
ps: just refreshed and was OK now in Firefox. Well, I spoke to soon...it's taking forever to refresh again.