I’ve just noticed in the last week that someone at twitter made a screwup.
The popup drop down box that allows you to block a user/report for spam went screwy about a week ago.
Please see this URL - http://screencast.com/t/Oy5nQyyzu6u0 - which has a screen capture.
Basically in the small red box area the popup that appears when you click on the human sillouhette icon is NO LONGER APPEARING.
Basically it has the incorrect alpha setting and is popping up but “BELOW” the information in the next section below so it is impossible to block someone/report them for spam.