On most Commons pages, both logged-in and logged-out. Chrome stable.
E.g. viewing https://commons.wikimedia.org/wiki/File:Example.jpg
Exception in module-execute in module wikibase.mediainfo.filePageDisplay:
load.php?debug=false&lang=en&modules=startup&only=scripts&skin=vector:2 SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse (<anonymous>)
at DepictsPanel.sd.DepictsPanel.initialize (<anonymous>:482:550)
at <anonymous>:483:962
at mw.loader.implement.wikibasemediainfo-filepage-add-caption (<anonymous>:483:976)
at runScript (VM655 load.php:13)
at execute (VM655 load.php:15)
at doPropagation (VM655 load.php:7)