ShunRun less extreme graphics settings, maybe run -dxlevel 90 instead of -dxlevel 98? I noticed something similar to this the first time I tried to run 144hz and joined a barnblitz 32 player pub. Props and people disappeared.
I'm on 144Hz, but I'm not running dxlevel98 because I've heard of similar issues.
komorebihttp://www.ugcleague.net/forum/showthread.php?33768-Crashing-on-Swiftwater/page2
http://teamfortress.tv/thread/22657/props-disappear-then-i-crash
There are many potential solutions across both threads, have you already seen/tried them already?
First thread debunks the suggestion from this thread that reinstalling fixes it. It doesn't. It then goes on to state that mat_hdr_level 2 might cause it; mine is at 0. That's the only helpful advice from this thread, besides someone saying changing configs helped them. I don't run configs.
Second thread gives no valid suggestions, because viewmodel_fov is now clamped to a valid range. In fact, that thread ends with further complaints that it's happening again and no fixes.
Wow many potential solutions, and literally all of these you could have determined don't apply to me because I posted my entire config.
Being able to use Google is not a replacement for common sense.