It might be good to add, this is an PRO install which i done about 4 months ago. Then because there was no wpml support in PRO i switched back to X and did some builds. The site is not finished yet, i need to rebuild it from another template. I have time to finish de design now and back wpml support is there for PRO i switched back to PRO. In PRO however i can't edit the pages. I just checked if i switch back to X i can edit the pages in cornerstone.
Thanks for your help