This might be a bit early to report a bug since this version of unity is still being tweaked, but I figured it couldn't hurt to report it anyway. The node previews are all black in the latest unity version, but they appear just fine in 5.6. I've been able to reproduce this on a clean install with an empty project, and on a couple different video card configurations. The shader balls are almost always invisible, and even the UV Coord appears as a black square.
I'm a new user to SF, so it's possible I might be missing some vital setting. Could you recommend other things for me to check? Thanks!
Customer support service by UserEcho