new

So today I launched a map i was working on yesterday, and all the props disappeared, spawn entities turned green (Half Life 2 spawn entities, I think?) everything was ungrouped and only the brushes and textures stayed. Is there a way to fix it?

Hey guys, brand new here. I've been playing the game for a couple years and the recent publicity of the Mayann Project has piqued my interest in map making, and would love to give it a shot, I have a lot to learn however! Also, playing on new maps is one of the best things in this game. Do you...