Workflow not triggering in background mode

Hi,

I have a workflow that is working fine in real-time, but will not trigger in background.  I have switched between the two modes multiple times with the same results.

The workflow trigger is on change in Status Reason for a custom entity.  Scope is organization.

I have two other background workflows in the same solution that trigger on other fields and work with no problem.

This is not a major issue, since I'm able to run in real-time, but it does seem odd to me.  Has anyone met this before?

Thanks,

Rob