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There are duplicate entries for names and groups in User browser and Group Browser. This is caused by the <install directory>WEB-INF/classes/osuser.xml file having the providers defined twice.

Make sure there are no duplicate entries in WEB-INF/classes/osuser.xml. If the JIRA installation type is WAR/EAR, please re-deploy WAR and restart JIRA. If the solution above does not address problem, try re-indexing JIRA, followed by a restart.

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Severity: Low
Article ID: JIRAKB104300816

http://support.atlassian.com/browse/JSP-15344