Unconstrained bodies in multibody part.

I have a mulibody part made from converted bodies. I can't convince Solidworks that these bodies should be bonded together, even when I tell it they are bonded. Hence I can't run a simulation.

I am also having issues with Solidworks telling me to define a material even though all materials are defined.

I am running 2018. Should have never upgraded.

SolidworksSimulation