Rectangle text boxes moving upon resizing

Has anybody had any issues with the rectangle text boxes re-sizing the opposite axis from the one that you're changing? I update the y-axis size, but the x-axis size expands. As far as I remember, this previously never occurred.

Normally, I like to use a margin of 2 and remove as much white space around my text as possible, but now when I try to shrink my text box, it moves and expands in the opposite direction.

I'm using ArcMap 10.1 Build 3143.

Thanks,
Andrew