I just upgraded to 3.1, and after refreshing I get the following error: 

> 
> **Fatal error**: Call to undefined
>  function wp\_cache\_get() in
>  **/public\_html/blog/wp-includes/functions.php**
>  on line **336**
> 
> 
> 

A quick google search led me to [this post](http://wordpress.org/support/topic/upgrade-to-31-wp_cache_get-issue) on WordPress support forum, however I tried disabling all plugins as suggested, and I'm using TwentyTen as my only theme.

I also set `define('WP_CACHE', false)` in the config, didn't help...

Any ideas before I attempt to roll everything back?

Any ideas?