I have no idea what's going on, but Galaxy suddenly went from having a nice purple background, to this terrible pink one. How do I fix?

I've reinstalled it.... and now everything is grey. What is going on?

Are you referring to the background on the client? If so, the background will hold on to the color palette and pattern of the art of the last game that you viewed. For example, if I were to view the page for Torment: Tides of Numenara, the colors and color patterns will give me a purpleish background. However, if I view the page for The Bard's Tale Trilogy, the background will be orange with a bit of green in the center.

It changes each time you view a game page. I wish they would give the option to lock the background when we click off of a game page but currently, that's the way it works.