User blog comment:Kirkburn/Technical Update: September 2, 2014/@comment-452-20140903181557/@comment-6901124-20140903205037

Hello 452,

The script has already run, but it will need to run again for any gallery created between the initial run and today. After today, any newly created gallery with a link will get it automatically.

If you do come accross any  older galleries that the script may have missed please be sure to report them via Special:Contact