How about a story of a problem encountered and repaired BEFORE the support question was asked on this forum?
I was getting a serious error message when I try to open the front page of my WPMU site:
Fatal error: Call to undefined function: graceful_fail() in /home/blogpeo1/public_html/wp-settings.php on line 245
What happened was this: I was doing routine maintenance and deleting a bunch of spam blogs. When I was done, I noticed that my main site had picked up two users who I never authorized to be there. I searched for one of these users and tried to delete him, and that's when I got the error message.
I checked the file in question and saw that the line referred to blogs being archived or suspended.
Apparently, when I tried to delete this rouge user, WPMu thought I was declaring the main admin site as spam. Wicked huh?
So, I opened up one of my other blogs, signed in as admin, and unsuspended myself.
Now, to figure out to un-invite these spammers.