Hello,
i'd like to offer you my prestashop skills. I am sorry i can't give you exact steps how to figure out your offline shop since the cache issue might came various of reasons, but if i have ftp access to your shop i definately fix it today.
----------------------------
I work daily with prestashop over 6 years. I know prestashop from top to bottom. I am familiar with every aspect of this eshop system. From adding simple features, theme modifications, creating custom prestashop modules to overriding core files and connecting prestashop to various API's.
Thank you for your time.
Kind Regards,
Jarda Nalezny