yeah , this has happened a few times before. i only recently got a demo though... but it's on my old pc that broke... fuck.
There are 2 bugs to distinguish.
There is the "materials" bug, which basically seems to render all thrid-objects objects like ladders, stairs, boxes, ramps etc invisible, yet still accessible. I have noticed a trend where this seems to happens pretty much on cs_assault (the css one) and dust2 (sometimes, also css one).

Then there is the "bug" which is basically the war3mod crash: in this senario, most people cannot buy guns, can only shoot with a gun that they SPAWNED with race-wise (such vagabond scout) only, and yet do ZERO dmg. Models will be appearing as if floating with their hands extended to the side, not holding a gun mostly or anything. All race abilities, ultimates, skins etc are disabled...
The only way out of this problem is changing the map, and it usually resets this.
I am not a 100% sure on the following, so dnt quote me, but i think it needs an admin to change the map, not an rtv, in order to fix the glitch? maybe.
Anyways, mikey has a demo of the first bug i described, not sure if he still has the second bug too (he was drunk that day as a MOTHER, but still was productive and recorded demos like a bawss) since my demos are not currently available for me to submit.