So, shortly after the upgrade, someone had pointed out they had a blue checkmark instead of a yellow one up in their address bar. For a while I still had the old yellow one, then sometimes I'd get a blue one after clicking around PF for a while, etc. I finally solved the mystery of when I get yellow vs blue checkmarks. If I put www in front of physicsforums.com, I get the yellow one, if I don't have www in front, I get the blue one. Try it and see: www.physicsforums.com https://www.physicsforums.com Now, I'm wondering, what's the difference? Most sites will just automatically redirect you to whichever one you're supposed to use...I think. Should we be using one preferentially over the other or anything?