I managed to manually upgrade version 3.1. It had its issues, but now it seems to be up and running again (all though the page seems to be not found.. that one i'll figure out later)
After manual upgrade I tried to restore the database I had back-upped earlier. MyphpAdmin doesn't give any error messages, everything seems to be fine. Just like every previous database restores I've made.
After I head back to wp-admin it upgrades the database normally but yet none of the posts, pages, media etc. won't show up!
I have tried restoring previous databases which have showed up normally in Version 3.0 just to check if the new back-up is somehow damaged, but same problem continues on them as well.
Is there something really simple that I'm missing or what is going on in here?
The upgrade of V.3.1. is something I never would have done if I would've known how much trouble it can make.