Clone a Clone with JoomlaPack
If you try to clone a site previously cloned with JoomlaPack without dropping the old_ tablez created by the reinstall - you're out of luck.
Here's the steps
Given a Joomla site created from a JoomlaPack restore
Prior to backing up the site, remove the old_ table from phpMyAdmin
Go to the database and run the following sql statement.
DR0P TAB LE old_banner, old_bannerclient, old_bannerfinish, old_categories, old_components, old_contact_details,
old_content, old_content_frontpage, old_content_rating, old_core_acl_aro, old_core_acl_aro_groups,
old_core_acl_aro_sections, old_core_acl_groups_aro_map, old_core_log_items, old_core_log_searches,
old_groups, old_mambots, old_menu, old_messages, old_messages_cfg, old_modules, old_modules_menu, old_polls,
old_poll_data, old_poll_date, old_poll_menu, old_sections, old_session, old_stats_agents, old_templates_menu,
old_template_positions, old_users, old_usertypes, old_weblinks
This should save you about 20 minutes.