Ugh. I clicked the shiny “upgrade” button trying to upgrade from Mediawiki 1.16.something to 1.19.something on one of my private wikis. Now I’m stuck because apparently the <Poem> tag has broken, I can’t fix the problem, I can’t go back to Mediawiki 1.16 and… ARRRGH.
There is probably some stupid setting in the stupidly lengthy and cryptic LocalSettings.php that isn’t compatible with something. All I have to do is learn up on all the changes to Mediawiki in the last 3 years to find out what settings have changed, figure out how to integrate that into my setup and… did I mention arrrgh?
This is why (insert witty defeatist linux truism here)