When you write "Superfly is a great and necessary addition, but please do not give up on Firefly." I'd not only second that, but I'd add "please stop breaking Firefly and put it back the way it was". I started a thread at the Smith Micro forum where I demonstrated that the same scene can render worse in P11 than it does in P10, and prior to that there was a similar thread at RDNA. I and others have submitted bug reports to SM, along with a reproducible and distributable scene, but that was three years ago so you can draw your own conclusions.

I'm often frustrated by scenes which display the artifacts you've illustrated, which seem only to occur when IDL or IBL is in use. The curvature of the affected surfaces, and their illumination, are also a factor. I eventually bought a copy of Poser 10 purely for rendering these troublesome scenes in. (I would have liked PP2014 to get a 64 bit renderer, but so far have had no success.) Until this is fixed I'm unlikely to have any interest in subsequent versions of Poser.