Use of Visual CSL editor with Mac Mendeley Desktop (V 1.12)

Hi, I'm trying to edit the J Med Chem citation style using the visual CSL editor (want to change the paper title so only the first letter of the title is capitalized). I have managed to change this in the CSL editor online but when I save the style Mendeley desktop brings up the error "Cannot install - undefined. Error: Make sure the that the address starts with http:// or https://". I am using CSL editor in Safari and I have the latest Mac Mendeley desktop version (v1.12). I noticed in a lot of the CSL editor blog posts that V 1.7 was needed but this is the latest PC version PC right? Is there a change I need to make to assure connection between Mendeley desktop and the visual CSL editor? Thanks Ed