BT has totally flaked out on 26.0. All the drop down menus have become translucent. There is no blue background only white letters showing up. When you try to click on the white letters, absolutely nothing happens.
I have tested on Safari 6.04 and everything is totally fine.
I have been running 26 too for awhile and do most of my work in it. Try clearing your temp internet files and cache and login again. If not work, do a restart of your computer. Let me know.