Doing the Building Escape section I’ve run into a problem, I exposed my Reach value to BP, did the GameModeBase_BP and DefaultPawn_BP and set up the project, my custom pawn has the debug line drawn out 1M in front, all good.
The problem comes when I open the DefaultPawn_BP and then select the component and modify the Reach value. When I change that, the line stops being drawn ever. Even setting it back to 100, it never draws the debug line again. 
I was able to delete the first DefaultPawn_BP I made, created it again and the line is back, but when I touch that Reach value, it disappears again.