Roraz: I managed to get the images to show (apparently it was a flickr side issue), however I have it set in the settings to show 40 images per gallery (I have api key set) with original sizes for images.
However I’ve found that if you set it to more then 20 images with original sizes, the thumbs dont link to the images but instead the page url (in this case http://www.mobilesacrifice.com/test)??
I looked at your page and the href attribute is empty rather than containing a link to the original image. I am not sure why it is not working for you.
It might be a version issue, please upgrade to Slickr Flickr 1.28 at http://wordpress.org/extend/plugins/slickr-flickr/
It is working below with 40 original size images using the latest version.
Gallery of 40 Tagged Photos
[code]slickr-flickr tag="roma" items="40" size="original"[/code]
Gallery of 40 Photos From a Photoset
[code]slickr-flickr search="sets" set="72157626322792151" items="40" size="original"[/code]