As the subject says, Garry fucked up whole movement system in update with noclip.
Here is the list of fuckups I noticed on any server, with any mods or addons:
High tickrates (>66) = total fuckup. Prediction does not work, movement does not work, jumping does not work…
Client gets stuck in some surfaces and walls. Error on client/server is “client stuck in object 0”. Enter “developer 1” into console and try some CS:S custom (i.e. surf) maps. This produces spazzing and laggy movement near walls and on some surfaces, making some maps totally unplayable.
Client can’t jump when running up a slope. This was “fixed” in some update before, but that actually made it worse. This makes unplayable all maps where you need to jump on slopes like that.
CMoveData:SetVelocity seems to be fucked up if player is touching anything.
Old noclip was fine, and there was no need for fucking up whole movement system.