Quote Originally Posted by Ted Grapler View Post
I did a similar update to 1.5.4 years ago and found what worked for me was to export just certain tables from the old database over to the new database. For example - categories, categories_description (etc), customers, customers_basket (etc), orders (etc), and products (etc).
This is a bad idea, and has produced the problem you are now seeing. A better approach would be to use your old database and let the system (zc_install) do the upgrade for you, based on the entire contents of the old database.