I have tried everything here. I have no plugins active and cleared my cashe. Same problem.
Doing my own research I found out this was thr problem with the ‘add media button in 3.5
“The error means that WordPress 3.5 combines all the scripts into one script loads them using load-scripts.php file instead of loading them separately. This certainly saves some loading time but causes multiple problems. Disabling this behavior will get rid of the error message. ”
I still don’t know how to disable it with the code provided in the link below but you may find this article really helpful in correcting the problem for everyone.
https://www.technize.net/add-media-button-not-working-wordpress/
Please keep me updated if/when this is fixed.
Thank you for your hard work.