Hi Konstantin,
I have been using your plugin for a short while now, but recently it has started showing images from another user.
I'm not sure exactly when or what has caused it, but I only just noticed it.
A few details for you:
WordPress: v3.5
Quick Flickr: v1.3
The plugin is configured to return a single photo from "badmonkeh", but the images currently displayed is:
http://www.flickr.com/photos/3freeport/8482716815/
I have no relation with this user.
Thanks for any help you can give.