Thumbnails do not resize

Hey i was trying this plugin out because im interested in buying your “widget bundle” on codecanyon but I can’t get the thumbnails to display a different size even after configuring in the options. If I put a thumbnail size of 200 it creates a box thats 200px in width but the actual thumbnail is 75px.

This is the most important part for me and i wish i can cure these headaches and just find a plugin that works :-/

Do you know what could be the problem?

http://wordpress.org/extend/plugins/better-recent-posts-widget/