[mclingo]

 NO, you actually didn't get most of that right.  
but yes on h264 and h265.   using DX11 copyback on lav filters.  
i am using 1080p screen, I don't have a 4k screen.
I can use any combination of risers upscalers i could before creators update.
I do use refresh rate changing (the madvr built in on)
I do NOT use reclock or need it. 

I can go with Sanear or with out it.

https://imgur.com/a/hN6nD  

 then you dont have a similar setup to me or others with this problem, thanks for you input but it doesnt really help. I'll try to clarify again.

Is there anyone out there using KODI DS in 4k with and ATI RX card that doesn't have any frame drops when not using reclock and using the current set of drivers / filters / MADVR and WIn 10 Fall creators update?   

I do find it funny on on doom9 on madvr forum you say this is well documented, as in many have the problem, but in truth, it's only your setup and your system doing it.  No one else has confirmed the problems you have.   but you act like everyone has it, since no one says there setup is fine.  But the opposite maybe true, it could just be your setup and no one feels like going through the trouble to post contrary evidence? 

Now it could also be, that with the update, someone else changed (like task manager did behind the scene) for you and now your system runs a bit hotter/draws more power/  could be a power supply consistency problem.   

I'm not trying to say to you that you are not experiencing these issues,  but i am saying that you can't say it's well documented when no one else is reporting the same thing.  

The FSE and other black screen issues are well documented, this is what I was referring to although I probably wasnt making that clear. Some other people have reported drop frames though. Anyway, I fixed it by removing 24p and inserting23p, ive never had to use this in 10+ years of using AMD cards so something has changed recently with something.

Unfortunately I now have the black screen problem now which was reported by tomadam25 a few posts back, anyone found a fix for that? KODI goes to a black screen on stopping any video, plays them fine however. i think this is a DS issue though as I have no problems with MPC-BE