Dragging and Dropping Blocks onto the right column doesn't work. The Block sticks to the cursor and you can only get rid of it by clicking into the left column.
Firebug gives the following Error: "Node was not found" code: "8"

Solution:
In moodle/lib/ajax/block_classes.js#175

    column.getEl().insertBefore(this.getEl(),main.adminBlock);

should be

    column.getEl().insertBefore(this.getEl(),main.adminBlock.parentNode);