Galleries suddenly broken in MediaWiki one-click!

Galleries have stopped working in both my one-click installs of mediawiki AND in my manual install from pre one-click days. Instead of seeing a gallery, I now see a string like NaodW29-gallery1f4db36e61632b7200000001 in its place.

This also happens if I attempt to recreate the gallery.

This is happening both in a completely stock install and in one where I’ve modified the MonoBook skin.


This is NOT GOOD. I’d appreciate any suggestions on how to fix it ASAP.