After I upgraded WP to 3.3.1, my AddThis settings page didn't display properly. It used to have 2 tabs. Basic & Advanced. Now everything is on one page & the Basic areas no longer show all the options that allow you to choose the format of the sharing tools.
I thought it was just an AddThis problem, but I tried to install WP Socializer as a work-around & the settings page for that only displays the logo bar at the top. It tries to display the whole page. You can see it for a second. But then it refreshes to only display the logo bar.
I have rolled back to WP 3.3 & then WP 3.2. Didn't help.
I have also tried it in Firefox, IE & Chrome and on several different computers. No luck.
I know the AddThis worked at one point because I was able to build a custom tools set.