Game suddenly becomes Windows Longhorn pre-reset levels of unstable after solving the P1 Chamber 12 replica in Chapter 3

[Alex]

I was playing the game casually like normal, and then I finished the test chamber mentioned in the title. After that, the game crashed when it almost finished loading. And then I tried again, by loading the auto-save the game created for me on that corrupted test chamber, and then the game crashed AGAIN. I launched the game again, and the lighting on the title screen was glitchy AF. Another crash. I launched it again, and it crashed on the loading screen. At this point, I had no other option than deleting my entire Portal: Revolution installation and then re-downloading it. I hope that'll fix the problem. I'll have to

noclip

my way through the entire game up to where I was before this uh... crash festival happened.

[Alex]

Update: the cubes disappear when up close for some reason.

[Alex]

Update 2: the sp_a2_fling_intro map (the one after P1 chamber 12 replica) works!