Hi,
a common mistake is that you may have converted the XYZ to another coordinate system. The results will be that points won't be displayed at the expected location. So you should try to import again the XYZ file, and while browsing and selecting the XYZ, pay attention to the corrdinate system specified at the bottom of the browsing window (in the field 'Convert from'), and make sure that the specified system is the actual coordinate system in which the XYZ data are provided.
You can also check that your XYZ file has an appropriate format, by comparing with available example data, for example those installed in :
C:\Program Files (x86)\DHI\2014\MIKE Zero\Examples\MIKE_ZERO\BatEdit
Hope this may help.
Best regards,
Mathieu