Hey man, make sure you are subscribed to all the content by doing !content in-game. If it still doesn't work, do the following:

1) Unsubscribe from all the content
2) Run "menu_cleanupgmas" in your console in-game
3) Close your game
4) Subscribe to the content 1 by 1 (wait for download to finish before proceeding to the next)
5) Launch your game and let everything load/mount
6) Join the server

Steam and gmod are stupid so "Subscribe to all" button doesn't work properly.

Hey man, make sure you are subscribed to all the content by doing !content in-game. If it still doesn't work, do the following: 1) Unsubscribe from all the content 2) Run "menu_cleanupgmas" in your console in-game 3) Close your game 4) Subscribe to the content 1 by 1 (wait for download to finish before proceeding to the next) 5) Launch your game and let everything load/mount 6) Join the server Steam and gmod are stupid so "Subscribe to all" button doesn't work properly.