This is CiviCRM 4.6.22 / Drupal 7 where I used civix to copy one of the give contact reports:
civix --copy=CRM_Report_Form_Contact_Summary generate:report MCat null
It also appears registered in the Report manager. However I cannot find and therefore not use it when I look in Reports > Contact Reports
I tried reinstalling the module, looked for clues in the log file. Any helpful advice is appreciated!