I am still experiencing a freeze after using a few of the editing tools: move, mirror, rotate...A click on autozoom usually unlocks the process at once. If you wait, it can be several minutes before you can resume working. During this freeze, the tools on the left side of the screen are not active. The freeze seems to be longer when many entities are concerned.
Win7- 64 bit - 17Go memory - Quadro 600/ 1Go