Tomaž,
There could be a few possible causes for your problem, but we'd need a little bit more information first:
1) What version of JFBConnect are you using?
2) Can you post (or Private Message) the URL of the page with the issue?
Once we know that, we can hopefully give an easy solution.
Finally, please post from the account you have an active subscription to JFBConnect with as priority support is for subscribers only.
Thanks,
Alex