See if changing on the:
/your_admin/includes/modules/products/collect_info.php
If changing around line 40 to read:
'master_categories_id' => ''[B],
'product_is_meat' => ''[/B]
);
and around line 350:
[B] <tr>
<td class="main"><?php echo TEXT_PRODUCT_IS_MEAT; ?></td>
<td class="main"><?php echo zen_draw_separator('pixel_trans.gif', '24', '15') . ' ' . zen_draw_radio_field('product_is_meat', '1', $in_product_is_meat) . ' ' . TEXT_YES . ' ' . zen_draw_radio_field('product_is_meat', '0', $out_product_is_meat) . ' ' . TEXT_NO . ' ' . ($pInfo->product_is_meat == 1 ? '<span class="errorText">' . TEXT_PRODUCT_IS_MEAT_EDIT . '</span>' : ''); ?></td>
</tr>
[/B]
makes a difference on that ...