As you saw over the last few days, various sites at GoDaddy were exploited causing lots of complaints on Twitter and in other places about GoDaddy security.
Well, today, many of those sites were reinfected (again) and GoDaddy tried to fix the them automatically. However, their scripts failed for some reason, leaving some sites with empty lines at the top of the PHP files, causing these errors to show up:
Warning: Cannot modify header information – headers already sent by (output started at..
So, if your sites are showing these errors, just run this script:
(right click – save as clear_php.txt, rename to clear.php and upload via FTP to your site. Open your browser and execute it as yoursite.com/clear.php).
That should fix these issues. If you need any help, contact us at http://sucuri.net/support