Strangely, none of those bugs you are experiencing are happening to me except one, the two objects placed within one another. It does appear random, sometimes they go supernova, but I am able to get stars to fly apart in opposite directions. Instead of combining, they shoot out into space.
This is what's hard about fixing bugs. One person could have 5 problems, another could have 10. It's like, what do you do? After they "fix" them, the person that had 5 could now have 10. And the guy who had 10 could now have 5.
Like the glitches that you're seeing, gabriel.dac. None of those things are happening to me except the objects flying away from each other (like mentioned above).
EDIT: Mine may not be pink, but it is flickering/blinking, like what shadow6061be mentions.