Scheduling an AppDesigner action using 'AT' from the command line does not run any of the actions (4313963)

Using AppDesigner to create an action set which includes several data exports and shell scripts which create a log file. This runs fine within App Designer and also if it's scheduled via Toad (using Windows Task Scheduler). However if the following statement is run from the command line:

AT 14:00 "C:\Program Files\Quest Software\Toad for Oracle\Toad.exe" -a "ActionsetName"

The scheduled task starts at 14:00 but just seems to keep running. Toad.exe does exist in the task manager but there is no icon displayed in the task bar and no reports are being produced.