Attached a sample file.
Import whit format "Tab Separator" and activate 2D point Draw point number & draw point elevation.
Run "View->Auto zoom" (point coordinates are out of default current view) and if you run "Select->select all"
you will see "Selected 330"
Finally I understood what was happening. Points are created in a layer other than the default one.
Somehow I couldn't find this documented anywhere. If one cannot import points onto the default layer, it seems it should be mandatory to define at least a layer for the points (and not optional as it is now).