Frank Dainese and Fabio Bellini released a patch for their latest scenery for X-Plane, which fixes the FPS problem in this scenery.
Laminar Research released X-Plane 11.50 which is breaking some addons. DreamFoil Creations' Bell 407 was one of them but the team already released a fix.
The amazing DreamFoil Creations AS350 for X-Plane works on the latest version of the sim but with some issues. DreamFoil has released a patch that takes care of it, though.