We recently did a server upgrade from Confluence 6.6.12 to 6.15.2 and the only issue we have experienced has been with the panel macro. When editing a page with panels, none of the panel titles are visible. To see them, it is necessary to edit the panel and save. Once saved, the title for that panel will appear. If there are multiple panels on the page, each panel has to be updated in the same manner to see the titles.
Has anyone seen this before or have any suggestions on how we can resolve this? We have a stage server we tested our upgrade on prior to performing the upgrade on our production server, and it did not exhibit this behavior.