Did you do anything that could explain why it stopped working 2 weeks ago? Like installed a new add-on, changed your graphics card, updated drivers, etc
I could try running vanilla blockland, the only thing I've changed was once when I turned the graphics down, opened fullscreen mode. After a couple days of playing like that, I didn't like it, so I turned off fullscreen and put the visual settings on high. Now they're stuck on low.