Now here's something that will drive anyone planning to make an underwater base completely insane. I was trying to do just that, until I realized I couldn't paint the background tiles... And things got even stranger when I realized I could paint some of the background tiles, but not the vast majority. I'm going to assume this has something to do with the tiles holding back the water behind them. I'd appreciate if this was fixed soon, as I enjoy building, but... This kind of kills a great deal of versatility in building underwater. As if that wasn't hard enough.