A few days ago I upgraded my wiki to 1.8.1 (from 1.7.something), and all of my parser function hooks (the tags with {{#Blah: ...}} syntax added with $wgParser->setFunctionHook) stopped working. (That is, they started showing up verbatim, unparsed.) I upgraded the ParserFunctions extension, the one with the conditional evaluation things and such, to the latest version, and they now work fine. But my own custom-written hooks still don't work. I tried comparing the new version of ParserFunctions to the one I previously had installed, but I couldn't figure out what changes were necessary to make it work in the new version. What changed about the semantics of adding such hooks in MW 1.8?