Hi,
Well, I gave a solution which should do the job in a previous message:
www.hikashop.com/forum/install-update/89...checkout.html#269173
This issue arises because of the way the product page layout was customized. There must be some </div> missing.
So in the show_default view file, adding one or two extra </div> at the bottom of the view file should do the trick.
I'm surprised they say that it takes a lot of time.
And even so, it's always possible to remove the customization of the view file by renaming one or two files in the folder templates/YOUR_TEMPLATE/html/com_hikashop/product/ (probably the "show_default" one) and that should automatically fix the problem since you'll then use the default display on the product page.
So these tips above should allow you to easily have it working.