Seems to be alot of issues due to this update.
Few Issues have come up with Garrys Mod 160
1. Blue screen after the game loads and does not fully load.
•open steam\steamapps\yourname\garrysmod\garrysmod\cfg\mountdepots.txt and remove all the games listed
•Open Garrys Mod and remount your games.
2. Missing models on the map
•Still looking into this. You may need to do the above fix. It might help
3. Guns firing to fast
•Looking into this, we should have a fix soon.
4. Crouching seems to be fast we well
Will add more as we find them.