Hi Breda,

fortunately there seems to be a simple solution to fix this:
When you are trying to convert certain products to product type BookX, you first choose the product type via a popup control. Let's say you choose "Music" at this stage. If you then pick the option where you choose from a list of products of type "Music" the page reloads and you get a multiple-selction field where you can pick a product. Now here's the bug: when the page reloads between these two steps, the popup where you choose the type to convert from resets back to "Product - General". That is why your product is not converted. If you reselect e.g. "Music" in our example, then your product should be converted properly.

This is marked to be fixed in the next release.

Regards,
p.