Is it the update the problem ?

I was playing Garry’s Mod with some addons, everything worked well but a problem appeared. I connected to Steam, it tells me there is an update for the Garry’s Mod. I install it, then I restart Steam and Garry’s Mod, I spawn a Zombie ( same problem with combine, metrocops, vehicles and entities ) and the game freezes. Is it the update the problem ? Does the update adds an addon limit ? (sorry for bad english )