I thought I'd also add to this bug just to say that this is definately a problem. I've had this issue since as long as I can remember. You have to be very accurate with the positioning of the mouse to get the resize handle, especially for resizing from the corner of a window. It's very hit-and-miss. My girlfriend and I both struggle with window resizes and I'm fairly certain it's theme independent as well.
I thought I'd also add to this bug just to say that this is definately a problem. I've had this issue since as long as I can remember. You have to be very accurate with the positioning of the mouse to get the resize handle, especially for resizing from the corner of a window. It's very hit-and-miss. My girlfriend and I both struggle with window resizes and I'm fairly certain it's theme independent as well.