Piwigo 2.4 has been released 2 months ago. Approximately 70% of Piwigo.com galleries are now running on this new version, including all new installations. They can take advantage of new features and new plugins such as GuestBook, Header Manager or Batch Downloader (I will write specific post for each of them).
This week, more galleries can be updated because we have installed plugin Embedded Videos (replacing GVideo) and themes Gally-Graphite and Gally-Grum Dark 2. The plugin Autosize is not ready yet for Piwigo 2.4, and many galleries are using it. Considering the major changes in Piwigo 2.4 for photo sizes, Autosize needs extra testing. If you want your gallery to be updated sooner to version 2.4, you should deactivate plugin Autosize.