The CSS bugs are mostly fixed after I've applied the changes. I was able to prepare these in advance but was stuck in traffic on my way home from work :)
As to why the content is broken... we use one particular extension which doesn't play nice each time ArenaNet upgrades the wiki software (we call this one "SMW" - we use it everywhere, it's a beast and it lets us do pretty things) . The maintenance script provided with SMW (intended to be applied after we do updates) just keels over and stops halfway through with the size of our SMW database.
So we end up running some scripts to purge pages on the wiki (same as happens when you click the clock as a logged in wiki user). There's about 100k pages on the wiki, and the script is ticking through the pages. It'll get there, just give it 24 hours and don't worry about it. We're working on it.
This is probably one of the reasons we don't upgrade very often.
(I still think it's amazing that ArenaNet host the...