I use a plugin called BackupBuddy to backup my sites and a script called Importbuddy to restore / deploy them. Generally this process works just fine and I’m able to restore my sites including plugins and settings without any problems.
However, for whatever reason, All in One WP Security and Firewall just doesn’t work after being restored by Importbuddy. It causes “Cannot Modify Header Information” errors on the wp-admin login page.
To be clear, All in One WP Security and Firewall works just fine on the site from which the backup was made, and I can install the plugin after I’ve restored/deployed the site, but it doesn’t survive the restoration itself – even if disabled while being restored. In fact, even re-installing the plugin won’t fix the errors after they’ve appeared.
All that said, does anyone have any idea what would cause “Cannot modify header information” errors? It’s my understanding that they’re usually related to extra returns in functions.php but that clearly isn’t the case since the errors occur regardless of the theme in place.
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