No problem.. you know that's what we're here for
We'll look into why the Canvas has to be set. Are you sure you're using the "Update Settings" and not "Use Recommended Settings" button? Either way, having the Canvas URL set really shouldn't cause issues.. of course, if you can't set it through Autotune and you really don't want it, you can go to the Developers area of Facebook and delete it there. I know that's not optimal and removes the fun of Autotune, but it can be done.
As for the unknown path, if you created a "Like" action in Facebook, you're likely using the built-in Like action. To check, in the developers area, go to Open Graph. Click "Get Code" next to the action you're trying to configure. In the "Create a New Action" section (in the middle), the last line of code will look like:
'https://graph.facebook.com/me/og.likes'
That last portion is the actual action name (og.likes). You should use that in the Action edit area of JFBConnect. If that action name has your namespace in it, it's *not* a built-in Action. If it doesn't have your namespace (og.likes does not), it's a built-in Action.
Yeah, we need to update our configuration guide with that little nugget. Sorry about that!
Hope that helps,
Alex