I installed the 2.3 release of ProRender for 3ds Max and also the newer public-beta build 2.3.391. Both of these seem to be missing the large, shipping material library that has been present in the previous releases. I am not sure if this is completely absent or if there are incorrect pointers (I dont know where this *.MAT file resides by default).
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I only have one user on most of my systems (Username is my name but is full Windows administrator). I have the same setup and result on multiple systems - one is an older Win7 laptop (w/ NVIDIA gpu) and another that is a newer Win10 (w/ AMDRadeon Pro WX7100).
I have the same problem, installed Radeon Render for 3ds Max and all of the folders installed by it are empty. Some lighting can be added but others ask for files that don't exist, like Image Based Lighting Maps. Materials like woods show up in the browser with the concrete preview. Loading such models later displays a warning about bitmaps missing. This happens on a Windows 10 Pro installation with only the admin account.