Hi,
You do not have the same problem of this thread.
I guess you have unpublish some countries but you address country custom field still have an unpublish country as default value.
You have to go into the HikaShop backend : Display > Custom field.
Edit the custom field: address / address_country
Right select your default country (Greece).
Save the custom field.
And it would fix your problem.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.