Yesterday I had the following problem; whenever I wanted to add a galaxy, the colour would be random. That stopped after restarting the software, but I'm currently having the same problem, except instead of it being random, they're all pink.. And this time not only galaxies, it's planets and moons too.
I saw the other thread about white galaxies, but considering they're normally the right colour I figured this is a different problem, so didn't post it there.