it seems that this should be just a plugin upgrade, waiting for atlassian to confirm that the provided version is compatible with conf 2.10.3
http://jira.atlassian.com/browse/CONF-15399
2.10.3 compatible version is here: https://maven.atlassian.com/contrib/com/atlassian/confluence/contributors/contributors/1.2.1.1/contributors-1.2.1.1.jar
Task
Closed
Critical
Upgrade Contributors plugin to v1.2.3+
2.10.3 compatible version is here: https://maven.atlassian.com/contrib/com/atlassian/confluence/contributors/contributors/1.2.1.1/contributors-1.2.1.1.jar