Workaround:
You can get your own flickr API key, and your plugin should resume working. There are a couple of steps you will need to do.
First, apply for an API key here:
www.flickr.com/services/api/key.gne
Once you have your key, click the configuration link to view the details for your new key.
- Enter your blog's title and a short description.
- Change the authentication type to Desktop Application
- Save
second, open up the file FlickrCore.php. This is in plugins/wordpress-flickr-manager/ directory
- Edit the var $api_key = "...", var $secret = "..." lines and change it to your own API key, and shared secret.
- save the file
third, go back to your plugin's option page and relink your blog to flickr account.
that should be it.
I'll see if I can do something to work around this for the next release, but this should be at least a quick fix for now.