I started writing this post because while working in a profile view with clearly visible horizontal keypoints (aka Cardinal Station locations) I was unable to get placement commands to snap to these horizontal locations. Before I finished, I was interrupted and ended up back working on the file with htis post unfinished.
As I was working, I suddenly realized that the tools were now snapping to the keypoints. Is there some toggle I may have hit upon, or was this a glitch?