I've been getting this message every time I tried to access my inbox.?

[echinopsis .]

For quite a few users mail has been down for many hours - meanwhile a message was posted on the official Yahoo Twitter blog: "We know some of our users are unable to use Yahoo Mail. We're on it & trying to restore access in a few hours. Sorry for the inconvenience."
User comments after the message was posted weren't exactly favourable...:-(
https://twitter.com/yahoomail/status/410505606198329344

Note: one of my contacts also had this problem - he temporarily disabled Java scripting and could get into his mail account that way. And once he was in, he enabled Java scripting again - maybe this will help others too...