aaronjheinen

This needs to be fixed in the plugin. The correct code in define.php should be:
define( 'OB_PATH_PLUGIN', WP_CONTENT_DIR . DS . 'plugins' . DS );

the WP_CONTENT_DIR can then be defined in your wp-config.php file as follows:
define('WP_CONTENT_DIR', dirname(__FILE__) . '/app');

Thanks Johann!

The development version appears to have the fix but not v0.6.1 on the official repository.

Resolved Another plugin “CYAN Backup” was causing the issue.

Am also getting a “not logged in!” error when not logged in.