There are no known problems reported about the contributors macro not working.
I tested it on an internal OnDemand instance and it appears to be working as expected.
Please can you raise a support request so that we can investigate your specific problem.
This means that the plugin is disabled or culprit. Being that said, lets check if the plugin is enabled. Can you please go to Cog Icon > Confluence Admin > Manage Add-ons and search for:
Under the "All add-ons". You can find it, by clicking in the drop-down menu.
If it's enabled, it means that it's broken. So we need to do a rebuild of the bundled plugins from scratch, as you can see here.
I hope this helps.
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