主要问题是一个

Wordpress Automatic Upgrade

1.2.2

版本的插件和内核本身的更新插件打架所致，只需把它禁用即可。

But alas, it did not work for me. I got the following scary error!

Fatal error: Cannot redeclare pclziputilpathreduction() (previously declared in /homepages/468/b1298473934/htdocs/r/wp-content/plugins/wordpress-automatic-upgrade/lib/pclzip.lib.php:5421) in /homepages/468/b1298473934/htdocs/r/wp-content/admin/includes/class-pclzip.php on line 5498

A quick search revealed nothing to me. But then another quick search did.

Apparently, it has something to do with the WPAU plug in and the folders? I’m not exactly sure since there isn’t anything pertaining to 2.7 directly, but at least I know I’m not the only one.

If I find anything else out, I’ll update this post. Wordpress 2.7 will probably come out before I fix the problem though. I might try to upload a nightly build though. I’ve never done it, but it might be worth a try.

Updates - The Fix

Along with the comments below, I figured out how to update your Wordpress 2.7. If you have the formerly wonderful plugin Wordpress Automatic Upgrade, deactivate it. Then proceed to update Wordpress. It’ll work without errors. Wordpress 2.7 introduces a new feature: no need to update by hand. So in otherwords, the WPAU plugin is no longer needed! (But thank you, WPAU plugin, for all of your hard work.)