Michael,
Did some more testing tonight and still very dumbfounded. There's nothing that I think re-installing would do. If possible, I'd love it if you could send a question to your host. Basically, I made an edit to the entry-point of the administrator area of JFBConnect. The specific file I edited was /administrator/components/com_jfbconnect/admin.jfbconnect.php
At the top, I added the following line:
That should show the text "blah" on a completely white screen. No template or anything else. That's not happening and I'm not sure why.
Can you contact your host and ask them if they understand why your server would be caching or not executing some code? Alternatively, is there some path configuration issues where the code is being executed from somewhere else? You can provide the example modification above which should help them diagnose as well, though they'd need super admin access to test as well.
I also tried the same edit to K2 with the same results, so this isn't specific to JFBConnect. I left that edit in there, so JFBConnect may stop working in the admin area soon, which it already isn't doing too well.
In the mean time, I'd recommend editing your Facebook app settings manually. Go to the
Developer Area
and click Edit Settings on your app. Mainly, you just need to set a namespace (which is likely already set), your app domain (in your case, that would be "xyz.net") and your Site URL (
www.xyz.net/). Once those are set, you should be able to configure most settings within JFBConnect, including the login functionality.
So, that should get you going for now, but you'll want to figure out what's happening on your server because I think you're going to run into other strange issues either with JFBConnect or other extensions in the future.
Thanks,
Alex