Theme reset, app crashes

Hello, I'm experiencing what's in the title. When i launch the app, theme is reset to default (system). I don't think I'm missing anything here, as I see a popup dating saying that settings are saved. The thing is that settings show correct options selected, but that doesn't correspond to the color scheme i see.

App also crashes after a somewhat short time. Fastest way is to look at a user's posts, then moving to a community. It happens also while scrolling on Frontpage. I tried to disable all of those I think are the sensible settings. Uninstalled and reinstalled.

Thank you for your time.