List of Likers is empty

I use the FX Theme 1.9

Fx Theme 1.9

Responsive Elgg theme

Author: David Varela - Lycaweb -

    and if I klick on "likers" (dont know which term is used in english, just the link, which should show the list of likers), then this appears:
    So: nothing, empty pop-up.
    Is this a known problem of the theme or maybe a conflict of plugins? The list of all my installed and activated plugins is here:
    Or if its now known: How could I workaround this? With another like-plugins or something like that?
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