Hello,
After upgrading to PHP 5.3 the wp_config.php which is included in the php file taking care of the ajax request, causes a large number of warnings, which are returned to the Quotes widget.
This issue can be easily resolved (although dirty) by adding a @ in front of the include statement in inc/stray_ajax.php:
@include_once($changedDir.'/wp-config.php');
I hope this helps other facing the same issue.
Maarten