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    Have you more than one store?
    Please look: app/code/local/Mage/Helloslide/Helper/Data.php (line 21)
    The extension works with store_id=1.
    Please change the store_id and try it!
    You can use Mage::app()->getStore()->getStoreId() or $this->helper('core')->getStoreId();
    I will try to change this.

    Hope it helps!