Thanks for attaching the model file @yon.leitner. I couldn't reproduce the invisible results when I solved the study, and there wasn't a setting toggled I could find which would cause that behavior.

The Simulation results are associated with the design version. If you see the message the results aren't up to date with the current settings, it indicates the design or Simulation Model has changed after the results were computed. Since the results are missing in the scene, I suspect Fusion somehow cannot find the downloaded results on disk for the file version that is open. Re-solving the study should allow the results to display for the latest file version.
If you've solved the study in previous versions of the design, you could try opening the older version(s) from the data panel to find which version lost the simulation results if you're curious.
Also, I noticed there are fully modeled threads. This can sometimes trip up the solver, especially when the threads aren't aligned between bodies causing interference. I removed the threads from the bodies in the cloned Simulation Model 2 (attached) which will solve in much less time.
Hope this helps...
Hugh Henderson
QA Engineer (Fusion Simulation)