[Plugin: Thumbnail For Excerpts] Thumbnails not appearing

I am trying to get this to work – really like the format. I uploaded placeholder.png and it autogenerated placeholder-90×75.png which should work right?

Here the example:

http://www.julianamaeberger.com/soma/words/

The featured image is duplicating here.

Any help would be much appreciated.

Thanks!

http://wordpress.org/extend/plugins/thumbnail-for-excerpts/