[gb2world]

I've attached my modified product.tpl. Remember - this is not a fix - it is just a hack - so use with caution.
It removes from the template decisions based on this variable: $product.quantity_input_box_enabled

with the impact of never allowing the quantity box to be input text.

I suspect the setting of that variable might have a problem - but have not had time to figure out how to duplicate the issue so it can reported as a bug.

It would not be a bad idea for someone to review the hack to make sure I am not missing any unintended consequences.