Magento Cart layout change not sticking
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<p>Sorry this is a novice question... </p> 
<p>I have changed the layout of my magento cart to popup.html.</p> 
<p>i have edited the checkout.xml to use popup.phtml... this is the code i have used in the checkout.xml....</p>
<p>  >          <checkout_cart_index translate="label">    </p>
        <label>Shopping Cart</label>
        <remove name="right"/>
        <remove name="left"/>
        <reference name="root">
        <action method="setTemplate">
        <template>page/popup.phtml</template>
        </action></reference>
<p>The problem is that everything was working fine... but i was making changes on the category page and suddenly the cart has stopped showing layout popup.phtml and has started showing 2 column-left and that too without the cart content.</p>
<p>i was making some changes to catalog.xml ... but cant see how it would override the display of checkout/cart</p>
<p>I have been banging my head around this for couple of hours now... Any suggestions as to where i should look to see whats overriding the popup.phtml completely and just displaying an empty two column layout with left column. </p>
<p>thanks..much appreciate..</p>