I have just installed the KA JavaScript SDK plugin. It is configured and enabled. You should see the comments on this test page:
test.purepoint.nl/nieuwsblog/42-hygiene-als-hot-issue
However, the SDK code doesn't show up in the source and the comments are not displayed. When I add the Facebook plugin code (from developers.facebook.com) directly to index.php, the comments are displayed (but are not posted to facebook).
What am I doing wrong?