I've been working hard to try and fix it: r51 introduced a change to try and fix it which didn't work, and I just released r51.2 with another change to try and fix it. Have you tried r51.2?
It's a very difficult one for me to fix because I have a nVidia card and everything works fine for me here, so I'm having to trawl through documentation, guess if there are any driver bugs, etc.
I downloaded a hotfix as r51.2 and tested making a sprite and i can see it at layout! :D
Everything is fine, i would like to consider buying a standard version at september before the price changes if is not early development version (possibly they will pay me for my job).