Jenkins 1.544 running in Tomcat 7
Version 2.6 of the Campfire Plugin.
Instead of referencing the campfire settings in the global configuration, the global values are duplicated in the configuration for each job.
The job configuration dialog does show empty fields and a comment about only needing to enter a value to override the global configuration, but it still stores the global value within the job-specific config.xml
The effect of this is that making a change to the global configuration doesn't affect any of the jobs - you need to go through and "clear out" the settings for the global settings to be re-copied to the jobs.