I am using the Corporate theme and the BP Moderation plugin that places a "Flag this content" button next to various areas in a BP/WP setup.
I have not done the update to 3.1 yet and am running 3.05 and buddypress 1.2.7.
In Internet Explorer on the "Create a Blog" page it only loads part of the screen.
If I switch the theme to the BP Default it loads just fine with the plugin activated.
Also in the Admin Dashboard under the Widgets Page it will not fully load with the BP-Moderation plugin turned on with the Corporate theme. The widget page stops with the Corporate Custom widgets and continually spins not fully loading the page.