this is a bug that managed to enter Plant Simulation version 13.1. The bug will be fixed in the next maintenance pack.
No, sorry. The model format evolves every version with new features that are added so that Plant Simulation only can load models from earlier versions (and of its own version, of course) but not from newer ones. Maintenance packs are another story - here, the model format remains compatible - but once a model has been saved with a particular Plant Simulation version, it is that version or a newer one.
I am not entirely certain what you mean. I assume that you want to emulate a Turntable using a Line. Animation-wise, you do that.
But personally, I would not do it. A Turntable does a bit more than just rotate for animation purposes.
Additionally, the next maintenance pack will fix the animation issue and, if the matter is urgent, I am sure that you can get a hotfix before that.
What I assume you are asking for, is a self animation.
As for virtually every object that you can insert in a frame, you can create and play a self animation, e.g.:
Line._3D.SelfAnimations.resetAnimation -- cleanup previously planned animations
Line._3D.SelfAnimations.scheduleRotation(0, 180, 30) -- rotate from 0° to 180° with 30°/s
Line._3D.SelfAnimations.playAnimation -- start the scheduled animation(s)
The rotation will be done along the axis and around the center that you have defined on the "Self Animation" tab.