Possibly an after-effect of this from yesterday linkage.
So, in the SEDE and run a query. All OK. Next, run another (not logged in) and get a CAPTCHA request, apart from one small problem - no captcha is displayed.
So I think "Fine, I'll log in". Sign in using my AOL OpenID, get this far:
and then click on "continue" and see...
Not sure if it's just an AOL OID problem.
Windows 7, 32-bit. Internet Explorer 8, ~9:36 UTC.