Missing parts of reflection

Very strange reflection. (See the picture.)

My system is Windows 7 Ultimate SP1. My Unreal Engine version is 4.5 from GitHub. Graphic card is NVIDIA GeForce 690. I have installed the latest 344.11 driver and June 2010 DirectX runtime.

What can I do to fix this? Please help.

Well, I found solution here:

Getting perfect result by reducing FPS. :slight_smile:

Also very interesting information is here: