I am unable to login to Super User. It gets as far as the first page below, without the yellow highlighting. I am able to login to my other connected sites fine - as well as make new connections to other Stack Exchange sites.
On Super User the OpenID icons get a bold box around them if I hover, but that's it - clicking does nothing.
All other sites are already highlighted yellow if connected, or become highlighted when I hover, if not connected. Clicking logs me in, or redirects to the proper page.