Windows Scheduled Task running Automation plugin without user logged in

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Hi,
I have setup a application that runs Navisworks using the Automation API.
It works well when run manually (user double click the .exe), and when executed by a scheduled task with the option 'run only when user is logged on'.
But when I try to set the scheduled task to run 'whether the user is logged on or not', the task fails when starting Navisworks: the Roamer.exe process appears in the task manager, but it shutdowns without having done anything after some 30 sec or so, and the application throws an error: "Failed to startup Navisworks: -2147024891"
The Navisworks application remains hidden, and the app has no call to the UI, be it any forms or dialogues.
The account I am using has all the required permission, and runs other scheduled task with this settings (that don't use Navisworks).
I have tried to run it with the licence borrowed and under different account as well.
Is there a limitation whereby Navisworks cannot run this way?
Anyone having experience running Navisworks Automation tasks in this way?
Nic