Ah I didn't realize I had that old exe still being zipped up, oops. That is quite old (hence the old temp name for the game). Very interesting, I primarily use firefox and I only was able to reproduce similar problems in Chrome previously, so it's funny that's the browser you didn't have problems with... but I don't think it's browser-related either. I speed-ran the game in browser to see if I could reproduce it but alas nothing yet. The invisible blocks bug would be in the old dirtpay version, but shouldn't be in the recent builds. The shaking... I have no idea anymore.
Heres a gif of the bug from a friend of mine
"my guess as a gamedev is the framerate is low due to the web build so the camera is moving towards the player in big stuttery steps, overshooting the player and then moving back again and overshooting further" is what they think the problem is. Hopefully that helps.
8 days ago(+1)
I figured out the cause is related to the camera smoothing and extremely low FPS (<10). Make sure hardware acceleration is turned on in your browser, or pull a Todd Howard and try on a better PC? I was able to reproduce it exactly as you get it by throttling CPU in chrome, and removing the throttle fixes it, so it's directly tied to fps.