I'm running v2.1.1 and I've noticed that if a photo has the same title on Flickr as another that is trying to display on the monitor at the same time, it overwrites it. Take my feed (timgaunt), if you filter on "Wallpaper", there are two sunsets in there, both called "Cornish sunset". I've got three monitors so if I load both of them up (one on either monitor) they should show different images on both but instead they show the same one...
Is there anyway you can name the files in a way that allows you to:
a. Only download the image once
b. Identify photos which are different but have the same title?
BTW you might want to look into integrating with Flickr's API to allow you to download all your photos. Just a thought
