For now I made the following changes to make this work:
admin/market_store.php line 381 I added:
PHP Code:
`image_big_1` = '" . $db->escape_string($vbulletin->GPC['image_big']) . "',
and added a new field to the 'market_store' table:
alter table market_store add column image_big varchar(150) not null;
Will this work? I am now able to edit store items but are there other issues to consider?