I have changed the thumbnail size in Settings > Media, functions.php and in my stylesheet.
In Firefox & Internet Explorer it has the correct size, but in Chrome it does not.
When I call for the featured image/thumbnail on my categories page, it does not display the size I have set (150px x 100px). But only in Chrome.
I use a child theme of Twenty Twelve. Any help would be appreciated.
You can see an example here: