Hi!
I had a huge problem when i imported a .XYZ-file, the pointcloud did not show up in the plan view but in the 3D-view i could see it sometimes. All other pointclouds i have been workin with has worked perfectly but not this .XYZ-file.
The problem is now solved and look att the video here and you can see how to fix it if it happens to you.
Have a nice sunday.