This appears to have been a problem with some conflicts coming from the Service Rocket Scaffolding plugin. There is an Atlassian KB article – Confluence Macro Usage page throws Page Not Found error. Additionally, from Service Rocket, this was supposed to have been fixed in the Scaffolding release 8.7.0 – Scaffolding 8.7.0 has been released.
We have the same issue too on Confluence 5.10! I can see that the Confluence Macro Usage add-on is installed and enabled.
Here's what we see in the logs:
2016-08-02 14:34:45,055 ERROR [http-nio-6189-exec-8] [atlassian.confluence.servlet.ConfluenceServletDispatcher] serviceAction There is no Action mapped for namespace /admin and action name pluginusage -- url: /kb/admin/pluginusage.action | traceId: 57e02c7fa0613d1f | userName: hmuth
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