Viewport in Material Editor - Low quality preview

1/ Viewport in Material Editor shows first good quality texture in preview.

2/ If I add a new Texture sample, preview become bad quality

3/ I have to open wood texture in texture Editor and close it, click on preview in Mat Edit, preview of wood is ok, but not seeing normal map

4/ I have to open normal map in texture Edit. and close it, click on preview in Mat Edit, all then all is ok.

System information
CPU: Bi-Xeon E5-2687W @ 3GHz
GPU: NVIDIA GTX Titan
SPD: 4X8 GB DDR2
OS: Windows 7 SP1

UE4.7.3

Hi PixShake -

I am not getting the same results that you are showing in your pictures above. Can you look at a few of the following settings and make sure that they are set as listed: Your Engine Scalability Settings should be set to EPIC, your Material Quality Level should be set to High, and the Preview Rendering Level should be set at
Shader Model 5. Also are you experiencing this issue in all of your projects?

Thank You and Let me know -

Eric Ketchum

Hi PixShake -

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you.

Eric Ketchum