I got my new code singing certificate and I fixed a few minor bugs. Super short dimension lines were becoming infinite due to the space calculated for the arrow heads. There was also a problem with gear and link rotation angles that went wrong after about two rotations of a gear fastened to a link.
So go get a new version if you need it. The Linkage page, available form the right column of any of my blog pages, has the links to the XP and newer Direct2D variations of the software.