Follow these steps in order:
If that doesn't work, try Validating Garry's Mod:
If that doesn't work, tell a Developer or Reply to this Thread for help.
- In Garry's Mod, go to the Main Menu, open Options > Game and change
- When a game server tries to download custom content to your computer: Allow all custom files from server
- After selecting that option, click OK
- Exit Garry's Mod and wait for it to close completely
- It will no longer show up as Running in Steam
- Make sure Steam is done downloading Garry's Mod - Workshop Content
- Click Downloads at the bottom of Steam to see its progress
- If it's In Queue, click the Up Arrow next to it to make Steam download it
- Start Garry's Mod and wait for it to mount Workshop Content
- The Workshop notification should no longer appear at the bottom
- Try rejoining the server
If that doesn't work, try Validating Garry's Mod:
- Exit Garry's Mod and wait for it to close completely
- It will no longer show up as Running in Steam
- In Steam, right click on Garry's Mod in the game list
- Click Properties... from the dropdown that appears
- Click the Installed Files tab
- Click Verify integrity of game files
- Wait for Steam to finish validating Garry's Mod
- Once it's 100% complete, Close out of the Properties windows
- Start Garry's Mod and wait for it to mount Workshop Content
- The Workshop notification should no longer appear at the bottom
- Try rejoining the server
- (Note) Validating Garry's Mod will remove GModCEFCodecFix if you had it! Re-run the tool after it's done to re-install the patches.
If that doesn't work, tell a Developer or Reply to this Thread for help.
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