TF2 Content Won't Spawn in Garry's Mod

The maps and props from TF2 won’t show up in Garry’s Mod. I went to the extensions and it said that Team Fortress 2 was checked. I’ll go to the props menu and click on something in the TF2 list, the spawn sound will play but nothing appears, or I click on the browse menu, click on the TF2 folder and none of the folders will appear. Anyone know what might be wrong?

I’ll guess this would be on Garry’s mod 12. Make sure TF2 is correctly updated along with other mounted source games. Un mount portal if you wish to see fire texture effects.