poltadaalu, nice discovery!
Although this fixes the conflict, it’s not a solution I will add to the next update, because this can lead to unexpected output again.
The inclusion of wp-load.php is wrapped by ob_start() and ob_end_clean() to discard any output from other plugins that is generated due to linebreaks outside the php tags (or other stuff).
Could you please try this out:
Instead of commenting out ob_end_clean() replace it with:
if(ob_get_level() == 1)
ob_end_clean();
So the whole block is:
@ob_start();
require_once(dirname(__FILE__).'/../../../wp-load.php');
if(ob_get_level() == 1)
ob_end_clean();
If this is confirmed to fix the NextGEN Gallery conflict, it will be included in next update of WP-Filebase.