It's come to my attention that some who have downloaded the beta editor for JA and are having issues finding shaders, getting skyboxes or lava to work, etc, might be having the same problem I had. Here is the solution.
Go to your Base folder in your JA directory, and make a folder called shaders . Now, go to
https://zerowing.idsoftware.com:666...k/base/shaders/) and download shaderlist.txt from there. Put the .txt file in your shaders folder, and you should be good to go. Then reopen Radiant, and it should show the shaders now, in addition to highlighting the shaders appropriately.
Hope this helps out most of you.