Gmod freezes at loading screen

Ever since the last update, I haven’t been able to loadup several of the maps at Gmod, not even for offline single mode. The game goes into the map loading screen and it stays on “loading world” without a single square appearing on the loading bar. I have no idea weather the map is loading and is taking forever, or if it the game simply froze. I even tried with one of the stock maps, gm_construct, and I got the same problem (however, it worked just fine for gm_flatgrass). Incidentially, the loading time for Gmod itself to open is longer than usual. The blue loading bar doesn’t even appear. So I don’t know what’s wrong. I didn’t download any sort of addon before the update so I don’t know what could have messed up the game. Should I re-install Gmod entirely?