Well, im triying to upgrade and i do it on a 60%. I do all pass i put on meta.wikimedia.org, http://meta.wikimedia.org/wiki/Help:Upgrading_MediaWiki#Upgrading_to_Version....
I describe all pases there, but i have a little problem, i can access all information except recent changes (i lost all of them...) and some images that contains punctuation signs (exists on english :-S...) like camión, méxico, etc...
My database is very big and perhaps here is the problem :-(, i try to do rebuildall and so....without any success. Well, perhaps need to hit hard to computer ;-) Its looks a half stop on process...
Please next mail you send write it more clear. It will welcome ;P
Write again and good luck. And feel free to modify my comments....