What was found
(CAN) SHORTLY FOLLOWING DEPARTURE, THE CREW WAS NOTIFIED THAT THE ACFT WAS NOT ON THE CLEARED PLAN. THE ERROR WAS CORRECTED & THE FLIGHT CONTINUED UNEVENTFULLY. UPON INVESTIGATION, IT WAS DETERMINED THAT THE FMS DID NOT PROPERLY LOAD SEVERAL POINTS BETWEEN THE SID & THE AIRWAY ENTRY POINT. IT WAS NOTED THAT THE FLIGHT PLAN UPLINK CONTAINED THE LETTER D FOLLOWING THE SID. THE FLIGHT PLAN SERVICE PROVIDER INDICATED THAT THEY HAVE OBSERVED, ON OCCASION, THAT FMS PLATFORMS INTERPRETING THIS AS MEANING DIRECT & SUBSEQUENTLY NOT LOADING ANY INTERMEDIATE WAYPOINTS. THE FLIGHT PLAN FILING STRIP CONTAINED THE FULL PROCEDURE, HOWEVER THE CREW DID NOT NOTE THE DISCREPANCY.