Have you clicked on a spline in the fairway mesh or the first cut mesh? Any spline in any mesh that surrounds the place where the tear has occurred should work. Clicking a spline will generally cause the mesh to snap back into place after you have done some terrain sculpting. The sculpting makes changes in the terrain below the meshes, not on the meshes themselves. So you have to cause the meshes to snap into place over new terrain work.
As I recall, when the underlying terrain breaks through the meshes like that, you need to smooth the underlying terrain to get rid of the tear. The meshes (the fairway, green, and other textures) sit above the terrain. All the sculpting work changes the terrain which lies beneath these meshes. Working with the Course Forge icons displayed in your screenshot (the ones that populate the left side of the screen in vertical fashion), select the third one from the bottom left. That should make the meshes disappear, leaving the terrain exposed. Do your smoothing on that level. Then refresh the meshes using the button that looks like a spider web (5th from the bottom left; or the bottom button in the top group of buttons on the left). That should bring the meshes back up. You can then click on a spline, or refresh the meshes, and they should snap into place over the terrain and, hopefully, eliminate the tear. At least that's what I recall. But it has been months since I have worked with this design program. If that doesn't fix the problem, see if you can find an answer in these Mike Jones videos:
http://www.perfectparallel.com/topic/69 ... tutorials/
In particular watch the ones on - show/hide the course forge mesh and advanced terrain sculpting.