Previous versions of this plugin relied on two rather fragile features:
For retrieving the items from DeviantArt, it used Yahoo Pipes. This service severly restricted usage recently, which resulted in no thumbs being shown.
For loading site pages faster, the plugin used file-based caching. The problem with this is setting proper file permissions, which is never fun.
That’s all gone now: version 1.9 uses the SimplePie class, bundled in WordPress. It retrieves items directly and also takes care of the caching.