When Nautilus is running it does not group open instances with the pre-existing docked icon. It adds this file cabinet looking icon to the task bar. I know this isn't default behavior and I'm wondering what could be causing this?
I believe I started noticing this happening after I upgraded (via update manager) from 11.04 to 11.10. Not 100% sure about that though. I do have a quicklist## Heading ##
In the picture I've got my mouse on the extraneous icon.