The red-outlined area of your screenshot shows a trailing ".jpg" after the text box. I installed the plugin but didn't try to use it yet because mine displays with the "." but not the ".png" (for this png file type): http://screencast.com/t/iow3tiQu
However, the jpg file type does show the .jpg: http://screencast.com/t/k8VqvHIRh
I wanted to double-check with you if this is a bug before starting to test/use it.