Design-Builder

I'm importing terrain data as a .txt file and it doesn't seem to load properly into the plan. No data points are visible and when I expand to full screen it just pans out and nothing is shown in the plan or 3D views. I've tried data points for a small site to make sure that's not the issue. I've replicated what is in the tutorial videos and can make it work, but not with my data points (ie. x,y,z coordinates 678898.9631,647827.3567,3). Has anyone else been having the same problem?