I have read many posts now about this issue but still can''t get it running.
I have disabled ALL plugins, cleared all caches, and added define CONCATENATE etc to my config.php file.
I have now also tried changing themes - still with no luck.
Everything works well with Posts, and I get all the pop-outs working well, but can not get the Add media button to work with Pages.
I am working around this at the moment by compiling everything in a post, then copying and pasting into a page, but this is clunky and will soon get tiring.
Is there anything else I can try in the short-term, apart from tearing out my hair and opening another bottle of red?