If you're having the problem that the shop button is dissapearing on SMF 1.1 RC2, then please try this:
Open Themes/default/Index.template.php
Find this:
//Begin SMFShop 2.0 (Build 8) MOD code
loadLanguage("shop");
echo ($current_action == 'shop' || $context['browser']['is_ie4']) ? '<td class="maintab_active_' . $first . '"> </td>' : '' , '
<td valign="top" class="maintab_' , $current_action == 'shop' ? 'active_back' : 'back' , '">
<a href="', $scripturl, '?action=shop">' , $txt['shop'] , '</a>
</td>' , $current_action == 'shop' ? '<td class="maintab_active_' . $last . '"> </td>' : '';
//END SMFShop MOD code
Change to:
//Begin SMFShop 2.0 (Build 8) MOD code
echo ($current_action == 'shop' || $context['browser']['is_ie4']) ? '<td class="maintab_active_' . $first . '"> </td>' : '' , '
<td valign="top" class="maintab_' , $current_action == 'shop' ? 'active_back' : 'back' , '">
<a href="', $scripturl, '?action=shop">Shop</a>
</td>' , $current_action == 'shop' ? '<td class="maintab_active_' . $last . '"> </td>' : '';
//END SMFShop MOD code
Tell me if that works for you