Trying this question here, as there are a lot of knowledgable folks here.

On my Pogoplug I installed Debian, and it's running as a web server very sucessfully. The box was built as bare debian, and the then the services installed using apt-get.

I have installed a web based Home Automation app, called homeautomation, which executes schedules as AT jobs submitted as the www-data user.

The jobs do not complete and just get stuck in the running state.
The only error I see is in the syslog which reports an authentication failure
This is the case regardless of what job I try to run.
Running the job as root is OK. Running the commands as the www-data user also works. I can su to www-data from root, but I do get a "authentication error ignored" message.

I have checked that www-data is in the at.allow and cron.allow, and not at.deny and cron.deny, and the account has a shell assigned:
does anyone have any idea what might be going on and how I can fix it. I am sure it's some account setting which just needs changing, possibly due to the order I installed packages in (apache before atd)