I have wp-fb-comments working on another blog, so this should have worked...
The only difference is the Fan Page was already existing, and then I created an App for this plugin to work. That shouldn't cause a problem, should it?
In the wp-fb-comments config page, I entered the App ID, API Key (same code as App ID) and Secret. I also entered the Page ID from the existing page.
On the App developers page, I have played around with putting the actual website URL and the 'fb CANVAS URL' which is generated (?) by the plugin. I have put these both in the 'Site URL' and 'Canvas URL' fields.
When I then press 'Connect Admin FBacc', I get the following error: Fatal error: Uncaught OAuthException: Error validating application. thrown in /Volumes/Data/Domeinen/therightjuice.net/infotherightjuicenet/Sites/wp-content/plugins/wp-fb-comments/facebook.php on line 543
Any ideas? Thanks!