I have just tried to upgrade my store to 1.5.6 and get the following errors at the top of the home page:
Plus my modifications did not show. Unfortunately I do not know which version of 1.5 I was running beforehand. I have put my backed up files back so the site works for now.Notice: Undefined variable: languages in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 52 Notice: Undefined variable: currencies in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 63
Notice: Undefined variable: text_cart in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 88
Notice: Undefined variable: text_items in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 89
Notice: Undefined variable: filter_name in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 94
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">Notice: Undefined variable: text_cart in /var/www/vhosts/theambercat.co.uk/httpdocs/gift-shop/catalog/view/theme/TAC/template/common/header.tpl on line 107Checkout
Not sure if this is relevant but I currently have a WordPress site in the root at theambercat.co.uk
The OC store is at http://www.theambercat.co.uk/gift-shop/
I have placed a copy of the WP site at http://www.theambercat.co.uk/gifts-for-animal-lovers/
The plan was to upgrade the OC store and move it to the root so that is what visitors see first and the blog is behind it.
Any help will be gratefully received

Just remembered that when I tried to use the backup function in admin I get line after line of errors. So many I have attached a screenshot to give an idea. Is this relevant at all?