"There was a security error when trying to login" - v1.3.8

[elliesupport]

The hosting company won't be able to help you. The template clearly hasn't been written for the current version of Zen Cart. However, this thread should contain all the information that you need to solve the problem, so it's most likely a problem with the way in which you have made the changes, but we'd need more information about your template and how precisely your have made the changes to help your further.

I uploaded the zc_install folder again and successfully upgraded the database from 1.3.6 to 1.3.7 but when i try to upgrade from 1.3.7 to 1.3.8 i get another error

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1062 Duplicate entry 'Customers who have never completed a purchase' for key 2
in:
[INSERT INTO ataste_query_builder (query_category, query_name, query_description , query_string) VALUES ('email,newsletters', 'Customers who have never completed a purchase', 'For sending newsletter to all customers who registered but have never completed a purchase', 'SELECT DISTINCT c.customers_email_address as customers_email_address, c.customers_lastname as customers_lastname, c.customers_firstname as customers_firstname FROM TABLE_CUSTOMERS c LEFT JOIN TABLE_ORDERS o ON c.customers_id=o.customers_id WHERE o.date_purchased IS NULL');]

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The site now has "Your database appears to need patching to a higher level. See Tools->Server Information to review patch levels." so I checked the Tools -> Server info and yes it tells me its at 1.3.7

any ideas how to get it to upgrade again?

Many thanks
Ellie