Triggers on master do not work when given a "Restricted node Label" list. All labels except master are triggered as desired, and an additional job is triggered that never runs. This extra job has the message "(pending – There are no nodes with the label '') ". I presume this is the master trigger that is causing the empty input parameter, as the job with the master input parameter is never run.

For the included config.xml, there are ~5 nodes labeled with Windows_7. Master is labeled Windows_Server2008.
All of the nodes with Windows_7 labels trigger fine.