SimplePie 1.1.1 is now available (also in a WordPress flavor). This is a bugfix-only release that resolves some of the things that weren’t caught until we released 1.1.
Fixes include the resolution of blank enclosures, “Feed not found” errors when the cache expired, problems with UTF-16LE data in the set_raw_data() config option, and an updated add_to_digg() URL.
Grab the latest release to upgrade!