Please submit a ticket at:
https://support.emagicone.com/submit_ticket
and provide us with your store connection configuration (you can save it at Preferences[F12] / Actions / Save current configuration), import configuration (you can save it at the last step of import wizard - http://screencast.com/t/859soIifs ), .csv file, so we could check what caused the issue for you. Please do not provide any details here, since it is a public forum