Lerpz 2D - Crates and Spaceship jumping everywhere?

Hi, I’m new to Unity and am starting with the Lerpz 2D tutorial. I can open up the project and run successfully in Unity. But once I start moving around crates or try to control the spaceship - the spaceship and boxes start going crazy and jumping/flying all over the screen.

It almost seems like an issue with the collision detection or physics engine or something. Is anyone else seeing this? If so, any suggestions on how I can fix it? I have gone through and ensured that all the appropriate game objects are set at 0 Z-Position - but this didn’t seem to help.

Thanks in advance.

There is a script attached to those objects called configurable joint or something like that…
From memory, disabling this script and using the constraints of the rigid bodies instead worked for me.
Constrain the movement in the z axis and the rotation around the x and y axes.