[balinor]

Back up what you have, and then try replacing everything between the mod comment tags with this:

{if $cat eq "50"}
{section name=cat_num loop=$subcategories}
{ if %cat_num.first% }
<table width="100%" border="0" align="center" cellpadding="5" cellspacing="0">
{/if}
{ if %cat_num.index% is div by 4}
<tr>
{/if}
<td align="center" valign="top">
<a href="home.php?cat={ $subcategories[cat_num].categoryid }">
[img]{$xcart_web_dir}/icon.php?categoryid={$subcategories[cat_num].categoryid}[/img]</a>


<a href="home.php?cat={ $subcategories[cat_num].categoryid }">
<font size="3">{ $subcategories[cat_num].category|escape }</font></a>
{ $subcategories[cat_num].description|escape }
{if $config.Appearance.count_products eq "Y"}
{if $subcategories[cat_num].product_count}

({ $subcategories[cat_num].product_count } Products)
{elseif $subcategories[cat_num].subcategory_count}
({ $subcategories[cat_num].subcategory_count } Subcategories)
{/if}
{/if}
</td>
{ if %cat_num.last% }
</tr>
</table>
{/if}
{/section} 
{else}
{section name=cat_num loop=$subcategories}
{ if %cat_num.first% }
<table width="100%" border="0" align="center" cellpadding="5" cellspacing="0">
{/if}
{ if %cat_num.index% is div by 2}
<tr>
{/if}
<td align="center" valign="top">
<a href="home.php?cat={ $subcategories[cat_num].categoryid }">
[img]{$xcart_web_dir}/icon.php?categoryid={$subcategories[cat_num].categoryid}[/img]</a>


<a href="home.php?cat={ $subcategories[cat_num].categoryid }">
<font size="3">{ $subcategories[cat_num].category|escape }</font></a>
{ $subcategories[cat_num].description|escape }
{if $config.Appearance.count_products eq "Y"}
{if $subcategories[cat_num].product_count}

({ $subcategories[cat_num].product_count } Products)
{elseif $subcategories[cat_num].subcategory_count}
({ $subcategories[cat_num].subcategory_count } Subcategories)
{/if}
{/if}
</td>
{ if %cat_num.last% }
</tr>
</table>
{/if}
{/section} 
{/if}