For the past one or two days, I haven't been able to log into my Stack Overflow account. It is associated with a Yahoo! login. I am getting this error:
So I assumed I have the same problem as here, but then that question is closed, and the issue is said to be resolved.
Strangely, I could log into the Meta Stack Overflow (and its login screen is layouted slightly different), so I could post the question. But I can't get back to Stack Overflow itself. This is with Firefox 27 (Mac OS X 10.6.8 (Snow Leopard)), cookie permissions are given to Stack Overflow and Stack Exchange.