Just recently I noticed some issues with the ground texture on my computer.
As you can see, the texture (grass, etc) is messed up. Sometimes chat text (above player heads) can get messed up too. I don't think this is on Jagex's side because the beta server (which doesn't get updated) has the same things. How can I fix this? I've tried updating Java and playing on a different browser (normally I play on Chrome). I don't think other common quick fixes (clearing Jagex cache for example) would work here.