Unreal keeps crashing in the material editor

I’m new to UE 4…I’ve just started learning the basics but I’ve tried to add a simple diffuse texture in the material editor and it crashed everytime. Restarting didn’t really help.

In the 4.18 i didn’t had this issue, but in the 4.19 it happens something, since i need the paragon assets to test things i can not go back, hoppefully the next engine version is based of optimizition.