Cant Save Webpart's property

Hello I am trying to add a content editor web part to a "Default Edit Form" page, to modify the JS link to point to a file i have on the site that contains Javascript. Now i have 20 sites i need to do this too, some of the sites it works perfectly, others, i cant save the content editor, once i enter the js link, i cant hit "Ok" or "Cancel" or "Apply". It seems as if the entire webpart is frozen. Ive tried different browsers, nothing works.