Hi Nickz
Well, it's been years since we made the website 1.6.0.4 and we haven't done any updates, so we felt it's now time to move to a latest version. ha ha We liked the idea of stock management and our website security has some issues.
worst case scenario, we may have to delete all product information imported and add them as new products as the issue is not a problem for a newly added a product. Well, we do have more than 1,000 products and don't want to go this way if there is a fix.
Thanks for your comments.