So I just bought and installed Universe Sandbox 2. When i started playing it, I did the introduction.
The introduction went smooth until I had to click and select a planet. It didn't work. I could click on it but that's it, it wouldn't show the specs of the planet. Once I restarted the introduction, it worked for me.
Now when I am playing the game normally i can sometimes click and select a planet and sometimes I can't.
Also when I try to add objects I will sometimes succeed and spawn the object, but sometimes I can't.
This inconsistency is very annoying. It makes it frustrating to play the game if i have to restart a simulation one or more times before I can just select or add an object.
My computer is a mid-2010 MacBook Pro with OSX 10.7.5