so I think I get what you mean, I tried it on 800X600 on IE and the layout is different with Mozilla.
Mozilla puts the right column out of screen because the center column is too large, but it stays usable. In IE, I can easily imagine that someone wouldn't see the delete icon. If I guess correctly, the green frame is messing up things there and making right column to overlap center.
Sorry about all those IE bugs, you see the team seems blind to that stuff.