I have update Lightweight Grid Columns plugin to 0.7 but there is always an issue when it is activated.
This is a one page web site http://www.format-ludique.fr/. If you click on the link “Contact” on the top of the page, it’s good. But if you click on the same link on an other page (“N’hésitez pas, contactez nous !” on this page http://www.format-ludique.fr/news/managers-we-need-you for exemple) the anchor doesn’t show the good section.