Missing vrmat images on library icon

[blueman2]

I downloaded a collection of materials from 3d warehouse. After opening the skp and opening Vray (Next), I saved all the materials to a library folder. When I bring in the folder to vray assets library, only a few have images associated with them in the library. However, if I drag one of those into the scene and open the settings in Vray, I can see the image in the icon window in the settings pane. I tried opening and closing the sketchup file as well as opening the library in a different skp.
Also, in the actual folder containing the library, all vrmat files have jpg files also with the same name. How can I get the sample icons to show images in the library samples that show up when that library is selected?

Thanks
Sketchup 2017
Latest Vray downloaded last week