two problems

[Mrepis]

Hello,
I have two problems on Universe Sandbox 2 .
First problem: the planets do not collide with each other, they are just getting through each other.
Second problem : the planets not orbiting another, they are simply a straight path .
thanks for your advices (i am french and using Google Translate, sorry  )

[Jar]

There's a known issue with some pirated versions of Universe Sandbox ² which prevents gravity and collisions from working correctly. 

You shouldn't run into these issues if you buy Universe Sandbox ² from the Steam Store:
http://store.steampowered.com/app/230290/