Hi,

I think that I've encountered a bug. I followed this tutorial: https://www.youtube.com/watch?v=cB5wYyc0J0c

and modeled a simple slider-crank mechanism:

The problem is that it doesn't work properly - you can see that the curves showing paths of points belonging to the mechanism are very short and motion of this linkage can't be simulated. However, it happens only when point 0 and point 2 have the same Y coordinate. When I move one of them slightly above or below the other, it starts working:

I also attached the .pyslvs file packed to zip below. Would it be possible to fix this bug ?

Crank slider problem.zip