This happened with WordPress 3.3
I noticed the issue and updated to 3.4 in an attempt to fix it.
It did not work.
I use a slideshow in my blog header.
The way it is setup, if there is a featured image in the post/page, that displays. If there is not, then the slideshow displays.
This is the code that was working until recently:
<div class="left"><?php if(get_the_post_thumbnail($post->ID, 'featured', 'title='.$post->post_title)){ ?><?php echo get_the_post_thumbnail($post->ID, 'featured', 'title='.$post->post_title); ?><?php }else{ ?><?php if (class_exists('Gallery')) { $Gallery = new Gallery(); $Gallery -> slideshow($output = true, $post_id = null); } } ?>
</div>
This is an example of a page that used to have the slideshow display:
http://www.washingtonautocredit.com/guaranteed-auto-credit/
I have tried playing with the plugin config settings, no dice.
Please help.