I received the following error
Fatal error: Call to undefined function wp() in /hermes/web06/b2573/hoc.mydomain/wp-blog-header.php on line 14
(replace mydomain with your domainname).
After researching this error, I started looking at my wp-config.php file and saw that it had been updated most recently.
[Why I have NO idea!]
I also noticed that in my case it had zero bytes. I remember looking at that file before, and I know it previously had data in it.
I have a backup of that file from yesterday, but for some reason can NOT delete, edit, or rename the zero byte file. I'm on the phone with my hosting company and they can't seem to do anythign with the file either.
I would say it's a permission problem, but I just verified I have read/write/execute permissions.
I also tried making a temp folder and can't seem to do that.
I know the ultimate solution is goign to be to restore this wp-config.php file, but there's got to be something screwy going on with the server.