Oh, and another thing

New to AutoCAD 2013, blocks and external references now have a visible, selectable border after you crop them with XCLIP. This border appears as additional lines in the drawing. It clutters things up.

Why would they do that, anyway? The purpose of cropping a block is to eliminate unnecessary stuff from your drawing. Yes, and then they add an unnecessary box around the part you wanted to be visible.

Yes, you can turn off the visibility of that border. But doing so only creates a more frustrating problem, because you cannot turn off the selectability of that border. You think you are clicking in a blank space on the drawing, and you end up selecting the block you cropped!