Are you talking about the “Gravity Forms” plugin or the “Gravity Forms (nl)” plugin? Our “Gravity Forms (nl)” plugin is just an extension for the “Gravity Forms” plugin. It is very unlikely that our plugin is making other plugins unusable. The “Gravity Forms” plugin isn’t a free plugin, you have to buy it at: http://www.gravityforms.com/. Good luck!
I resolved the issue, Remco but without being able to access the Gravity Forms documentation, it was a real PITA. Carl at Gravity Forms was quite helpful but also restrained from being as helpful as he could have been. Our Gravity Forms license was purchased over two years ago by a previous webmaster for this site. He couldn’t tell us what became of the license number and didn’t know what email address he used at the time of the purchase. Since your basic documentation requires those prerequisites, we were hamstrung in trying to get help. In retrospect, it would have been much easier and effective for us to get another plug-in, particularly one that allows the public to view its documentation.