I cannot get the Feed Creator working properly on either of my servers. I run up-to-date WordPress blog installs on both of these servers, with no problems - if that tells you anything about their PHP status.
I installed Feed Creator by FTP uploading the folder, and then I had no problems loading the …/feedcreator/index.php
I then ran an extraction for Preview of the feed. But the RSS Preview content does not load, while the exact same extraction test works fine on your http://createfeed.fivefilters.org/ and gives me a viable feed.
Preview does give the title of the target page, but nothing more. When I then try to load the feed into an RSS reader, the feed is also empty. This same problem occurs with my installations on either server.
What am I doing wrong? Are there some additional FTP permissions that need to be set on certain of the .PHP files?