That and the server missing stylesheets if not rebooted periodically. If you try editing articles then you're even worse off- only half the saves go through and some articles simply cannot be edited.
It's all a bit technical but I've tried convincing
@Marvin to just migrate all existing articles to a fresh install of MediaWiki. This would probably mean losing some features but would bring us up-to-date with per-section editing (much needed in larger articles), better mobile support, better history management (like diffs), etc.
If you've got some money I'm sure donations would be a nice incentive. Let's be honest here, it's a much nobler cause than that other, much less lolsy ripoff site wiki-pedia or something.