The zclip ('show') function actually calls the jquery show method, not the Zclip function.
Another tip is to trigger a window resize or load event. You can see the function of binding to it in the code.
a(window).bind("load resize", function(){ d.reposition() })
then every time I add / remove an item to my page, I call
$(window).trigger('reload');
It does the trick for me.
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