Hi
Could find the exact file includes/tableau/templates/tpl_product_info_default.php.
(Even in the source files I downloaded.)
but tried it in includes/tableau/templates/tpl_product_info_display.php which had that exact line you told me to change.
No joy.
I haven't actually change anything but the basic config in the template menu... could it be cause it's 1.5.1?