Every time I start a new game in the new update, the Skybox is messed up, I have no hud, pause menu, spawnlist, and every time I jump the map glitches. I was really excited for the update, but now I can’t even play Single Player. Multiplayer works fine, so I have no idea why Single Player hates me :L

This is usually caused by old left over lua files in your garry’s mod folder. This would explain why it works properly when you’re on a server (because you’re using the Lua files from the server).

The best way to fix this is to clean your Garry’s Mod folder.