Q:
Diagram 2.0 crashed when pasting a small part of a hierarchy that had been copied using Edit/Copy.
This was the console Message:
Apr 20 13:48:04 black_jasper Diagram[478]: objc: FREED(id): message isKindOf: sent to freed object=0x1c2ae0
A:
This is fixed in 2.1. It seemed to be related to copying lines with intermediate vertices without copying the objects they are connected to. When you drag to select some objects and the lines connecting them, such that some lines are selected but not the boxes they connect to, Diagram! can crash with the message you sent. I suggest that if you use 2.0 again you should select lines to cut/copy/paste, you select all the objects they connect to as well. You should upgrade to version 2.1.
Valid for 2.0.