SetUser failed - Access denied

Hi,

We are currently using BF 7.1.2 and some of our scheduled tasks are not run for some reason. I took a look at today's catalina's log and found the following.

I'm assuming that since the SetUser call fails that the scheduling then fails. What would actually cause a SetUser to fail?

Here's part of the log (I hope this is enough information)
<pre>
Jun 17, 2011 4:30:20 PM com.buildforge.services.server.api.AuthContext setUser
WARNING: SetUser failed - Access denied
Jun 17, 2011 4:30:20 PM com.buildforge.services.server.manager.CronManager scheduleBuilds
WARNING: Couldn't schedule job for schedule 'Scheduled_CronTask'
com.buildforge.services.common.api.APIException: API: Authentication Error.
at com.buildforge.services.server.manager.BuildManager.canBeFired(BuildManager.java:358)
at com.buildforge.services.server.manager.BuildManager.createCronBuild(BuildManager.java:1781)
at com.buildforge.services.server.manager.CronManager.scheduleBuilds(CronManager.java:718)
at com.buildforge.services.server.manager.CronManager$CronScheduler.run(CronManager.java:896)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
at java.lang.Thread.run(Thread.java:810)
</pre>