OmniGraphSketcher 1.6.4 is a minor update that fixes problems with dragging points and generating thumbnail previews.

• Fixed a problem that resulted in OmniGraphSketcher becoming unresponsive when a snapped point was dragged away from a line.
• Fixed a problem where generating thumbnail previews in the document browser consumed too much memory, causing OmniGraphSketcher to become unresponsive when launching after an app or iOS update.