I couldn't quite seem to find what was causing this or where in the help manual this means. But I'm assuming it's BAD haha.
Hrjove - if you're reading this - I did your rolling cube tutorial but was trying to use this method with a legacy node. I simply grouped all of your nodes into a group node called Roll on Ground.
I'm sourcing a custom mesh (can't show) and sourcing a null to drive the matrices in the viewport. If i try to cache this to alembic it crashes cinema. I assuem it's cause of these red nodes but i've no idea why this wouldn't work