When upgrading Confluence we needed to update some of the Plugins for compatibility. (thanks for the upgrade check, works like a charm)
When I tried this for a specific plugin I could not see the detail of this plugin when expanding it on the "Manage Addons" page. (See attached screen shot: UPM works, Gliffy Diagramms works not).

While it was no problem updating the plugin by downloading the new version from the Marketplace and uploading it via the "upload add-on" link we do need this detail view as soon as we need to update the license information for this plugin.
So how can we get the details of this plugin visible again?
Regards
Reinhard