iMac G4/1.25 RAM Flat Panel, OS 10.4.11, NAVM 10.1.2: Suddenly I'm getting NAV for Mac Alerts: "Scan Engine not installed", so I reinstall NAV for Mac 10.1.2 from CD (I can see it says installing scan engine, YET it never seems to get installed and the alert keeps coming back.) Whazzup?