In your RVT node (the green one), make sure you set the RVT texture for your terrain. And try setting the “Mip Value Mode” to Default. If you don’t use masking (holes) on your landscape, you can remove the Landscape Visibility Mask node.
I’d like to see a screenshot of your terrain RVT texture settings. You need to select a “Virtual Texture Content” that can store what you’re suing. If you’re not using masking, I think this one is good:
YCoCg Base Color, Normal, Roughness, Specular is good enough.
Let’s try to get a proper output first before changing the other settings.
On your Landscape, set “Draw in Main Pass” to Always.
Also, the bounds must be set correctly on your RVT terrain actor. This thing is really buggy to set up, but you only have to do it once. Under Volume Bounds, select your landscape. Then click on Set Bounds. For me, doing both in the same session doesn’t always work. I tend to set the landscape. Shut the editor down and restart it. Then I click Set Bounds button and it usually works. Snap to Landscape should be on as well I think.
If you can confirm these things and it still doesn’t work, we’ll try to see what else could be going on.
edit: Oh, and it seems your texture pools are fine for the time being.