honestly I have noticed absolutely no negatives with 4.12.
I'm pretty much convinced that my only problem with s3d - ie:it crashing when you click the 'update profile' button - is something endemic to simplify 3d and the way it uses the system registry to store profiles.

I rolled back to version 4.0 - and had exactly the same problem.

Short of wiping the s3d registry storage and starting again - can't see any way to clear it.
They need to shift from profiles mstored in registry to being stored in normal external files.

But that's my only issue.
Other than that it works as it always has.

I will say that 4.1 did crash a lot on windows 7 - and apart from the profile update - all of that has stopped now my new machine is running 10 pro.
Which given that they will have been aiming at 10 for a few years - makes sense.