AbleCommerce Shopping Cart Software

Anyone seen a similar error?
"Unable to cast object of type 'CommerceBuilder.Products.ProductCustomField' to type 'CommerceBuilder.Stores.CustomField'"

We get this when trying to copy a product. We are using Product Custom Fields for some data that we need to store, but couldn't find another logical place for.

This is a known issue, it happens when you initiate copy command on some product that has some entry for ac_CusotmFields table. You can track progress for this bug here
http://bugs.ablecommerce.com/show_bug.cgi?id=8239