Odd, Innit?

Curious: the spellcheck on this site turned up last night in Imperial English. It has objected to neighborhood, aluminum, color, vise (the clamping tool), endeavor and paralyze so far, so it's fairly simple to spot a trend here.

I can't find anything under 'my account' to toggle it, so I'm guessing it's that way throughout the site right now. Is there a way to change it back for U.S. users?

Eric