falling through the floor

i have been playing garrysmod for a while now and i have never had any online problems, but when i try to connect to a server now, all of a sudden i start glitching so that im through the floor, it doesnt do this when i create a server, and it doesnt do this in singleplayer, i just recently got a message from steam saying that my account was used to log in from another computer, so i deleted clientregistry.blob and thats when the problem started. do you think that that could be the problem? does clientregistry.blob do something else that i dont know, or was it something i downloaded from garrysmod.org or a server? help would be much appreciated i’d really like to play online again