[nevets1219]

4.1.X requires major code changes in order for the categories to display. The following is based off of what others have posted (I just extended it to 4 levels deep). The associated CSS can be generated/found here and be sure to add this. I've named mine "flyout" but I believe the link named it something else so be sure to change it to match. This is still somewhat of a work-in-progress, for me IE has display issues (ie note how the root level looks compared to the other levels) but maybe it won't be a major problem if you know your way around CSS which I don't. If you want to work around with it, I'd love to see it fixed up!

The code is just what I did and it "should" work. I'm still looking to make it more efficient or remove any unnecessary code. For numerous categories, you can generate a static one and place it in, but you'll probably have to update it continuously (depending on how you configured your product options) - this is dynamic. Very similar to what's offered here but is done with what was provided on the forum, a little tweaking of my own, and the CSS site I linked above - I think in my version it fixes up some minor HTML issues that exists in the XCartMods one (such as empty LI / UL / etc).

Works with CDSEO to the best of my knowledge. Completely CSS driven (I think :P)
Root
- Level 1
- Level 2
- Level 3

<div class="flyout">
   <ul>
   {foreach from=$categories item=cRoot name="RootCat"}
      {assign var=in value=$cRoot.categoryid}
      {if $allsubcategories.$in ne ''}
         {if $smarty.foreach.RootCat.last}
            <li><a href="home.php?cat={$cRoot.categoryid}" class="flyoutlast"><b>»</b>{$cRoot.category|escape:'html'}<!--[if IE 7]>
         {else}
            <li><a href="home.php?cat={$cRoot.categoryid}"><b>»</b>{$cRoot.category|escape:'html'}<!--[if IE 7]>
         {/if}
      {else}
         {if $smarty.foreach.RootCat.last}
            <li><a href="home.php?cat={$cRoot.categoryid}" class="flyoutlast">{$cRoot.category|escape:'html'}<!--[if IE 7]>
         {else}
            <li><a href="home.php?cat={$cRoot.categoryid}">{$cRoot.category|escape:'html'}<!--[if IE 7]>
         {/if}
      {/if}
         <!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
      {if $allsubcategories.$in ne ''}
         <ul>
         {foreach from=$allsubcategories.$in item=sc1 name="SubCategory_Level1"}
            {assign var=in2 value=$sc1.categoryid}
            {if $allsubcategories.$in2 ne ''}
               {if $smarty.foreach.SubCategory_Level1.last}
                  <li><a href="home.php?cat={$sc1.categoryid}" class="flyoutlast"><b>»</b>{$sc1.category|escape:'html'}<!--[if IE 7]>
               {else}
                  <li><a href="home.php?cat={$sc1.categoryid}"><b>»</b>{$sc1.category|escape:'html'}<!--[if IE 7]>
               {/if}
            {else}
               {if $smarty.foreach.SubCategory_Level1.last}
                  <li><a href="home.php?cat={$sc1.categoryid}" class="flyoutlast">{$sc1.category|escape:'html'}<!--[if IE 7]>
               {else}
                  <li><a href="home.php?cat={$sc1.categoryid}">{$sc1.category|escape:'html'}<!--[if IE 7]>
               {/if}
            {/if}
            <!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
            {if $allsubcategories.$in2 ne ''}
               <ul>
               {foreach from=$allsubcategories.$in2 item=sc2 name="SubCategory_Level2"}
                  {if $smarty.foreach.SubCategory_Level2.last}
                     <li><a href="home.php?cat={$sc2.categoryid}" class="flyoutlast">{$sc2.category|escape:'html'}</a></li>
                  {else}
                     <li><a href="home.php?cat={$sc2.categoryid}">{$sc2.category|escape:'html'}</a></li>
                  {/if}
               {/foreach}
               </ul>
            {/if}
            <!--[if lte IE 6]></td></tr></table></a><![endif]--></li>
         {/foreach}
         </ul>
      {/if}
      <!--[if lte IE 6]></td></tr></table></a><![endif]-->
      </li>
   {/foreach}
   </ul>
   </div>