About a week ago I couldn’t get terrain to work because when I imported it, only the skybox would show and it said there were a ton of brushes, but I couldn’t select or see them. Sometime around then, I fixed it and I’ve been making a few maps, and tons of terrains lately. Just last night at like 4:00am before I went to bed, it started doing the same thing again, and now when I open the maps, it shows nothing. Does anyone know what I changed, or am doing wrong?
Radiant/Terrain problem...
Shallow
(Shallow)
#2
If your whole terrain is disappearing, you probably just have detail brushes filtered. Use Ctrl-D to toggle this filter on and off.
Mr_Repair
(Mr. Repair)
#3
Thank you very much Shallow. 
I must have pressed control-D sometime without knowing it.