Solutions to common upgrade problems
Solution: Refresh! Shift Refresh! Control Refresh! Restart your browser. Clear your cache. (Normally a simple refresh is enough but it depends a lot on the browser that you’re using as well as your browser’s plugins, your OS and your ISP)
Issue: My admin interface works fine but my blog’s public interface is having problems.
Solution: Try switching back to one of the standard skins included in the distribution in order to make sure whether or not the problem is due to a third party skin.
Issue: I switched back to a standard skin but my blog’s public interface is still having problems!
Solution: Try disabling all your plugins (you won’t lose your settings) in order to assess whether or not the problem might be caused by an incompatible plugin.