I was just about to post a bug-report showing the "Sort by:" phrase only appearing in IE, and not it Chrome and FireFox. I did all the screenshots on my RC2, and then I thought the screenshots would be better showing the official xF forum. So here I am, loading the forum in IE, and the phrase is not displayed.
I did a quick search on the forum about this issue, but could not find anything.
Here's my forum in IE:
notice the "Sort by:" phrase.
And here's the official xF forum in IE: