possible bug

I've noticed a "glitch" in the background , I don't know if this is part of the rendering or because I play on a cell phone, but some backgrounds (like Fang battle's sunset) It only appears in "Software" mode, while in OpenGL you see a black, empty backgroud , It's a little annoying because it...

Every time I try to enter fullscreen, the game does this. I adjusted it in the video settings, but every time I toggle fullscreen mode, this bug keeps returning. I don't know how I can make the game remember my video preferences. Also, whenever I try to load an addon, it gives this error. I...