Having problems with both 2.8 and and even tried 2.8.1beta on the Theme Editor in FireFox and Safari. This is with a new install, no plugins. When first loading the Editor the style.css shows up fine. I can update this file as well. But when I select and any other template file the editor disappears. I am only left with the header and the left nav bar.
Anyone else having this problem? I have not had this problem with earlier versions.