Reflections flickering (4.2.1)

When I open Realistic Rendering or another sample with reflections (such as reflections subway/sci fi hallway), The materials’ reflection keeps flickering between normal and BRIGHT, off and on very fast.
I noticed it after I was attempting to use reflection spheres/boxes in a test and decided to open the samples so I can see how they were done.
It was then that I noticed the realistic rendering example was a bit too shiny; I mean the walls looked shiny, the table did, everything did. The problem seems to happen in reflection capture areas, like there’s a collision overlapping problem.

I thought maybe there was something going on with my computer, the files, or the engine: I deleted the files and recreated them, I shutdown and restarted my computer and deleted/redownloaded the engine and the problem still persists.

I then loaded the files into a different version of the engine and it was gone (and I could once again see how it’s suppose to look)

Does anyone know how to fix this?

OS: Window 7
GPU: Nvidia GTX 770
UE4: 4.2.1

Previous reports of something like this mentioned using a beta driver from nvidia at version 340.43.
I was using 340.52 and thought it was fixed, I tried the rollback to 337.88 and it worked.

Problem fixed.