Forgemod working + Save Code Caüability Pub problem

[EnergyCola]

Got a Awesome easy forgemod.
Can use private to build zombie maps
can use private to build whatever i want
can use online to but here comes the problem

If i start to build walls ect. while a players is trying to joining my lobby it crashes.
If nobody joins anymore (we are 12) i can build whitout crash pub game.

Can someone help to fix it?
and i will share the best Forgemode, easy to use and saving every code on a .txt file in C:steam/steamapps/common/codmw2

IM NOT ALLOWER TO POST LINKS IF I TRY TO ADD PICTURES FROM IMAGESHACK!

sorry im old on this forum and its just a picture i dont know how to add here to see it