I'm sorry to gatecrash in this topic but I have the very same issue with middle column content spilling over in the right margin on product description page. Is there a way to re-arrange the position of the product description elements so that they are shown underneath each other isntead of next to each other, thus avoiding the overlap? I don't think this can be solved by just reducing the font size.
http://doccado.com/
Using default Prestashop template, version 1.261
Thanks for any feedback.
Rgds - Chris