World fucked up after update

Hi, after updating the craftbukkit to 1.3, and after converting the world, I noticed that my spawn is at a different location(or my spawn is gone), and that some house are cut in half, is this going to be fixed? Because me and my friends have spent days building the massive stuff we have, and anyone know why this has happened?

 

hrm... I hope you backed it up

 

you should always back your stuff up mate......

 

Bukkit is still in development and things like this - although VERY rare - do happen. That is why it is advised to keep backups of your world.

 

Restore a backup!

 

And how does one go by fixing this problem, if there were no back ups made?

 

Rebuilding and resetting spawn using one of the spawn setting plugins