Until now, I'd never had a problem with a WP upgrade breaking something. Alas, my string of good luck has ended.
After I upgraded to 3.1, the row of buttons by Upload/Insert on the New Post screen have become inactive. I can mouse over them, but clicking on them does not allow me to "Ad an Image" or anything similar.
I don't think it's a theme problem because it's in the admin interface. Does anyone have a fix or a trouble-shooting suggestion?