We recently updated our site to ACF 5.02 and then this morning after having problems I updated to 5.03 but the problem persists.
When I try to upload an image, nothing happens. Opening firebug I see the following javscript error:
TypeError: wp.media.controller.EditImage is not a constructor
I tried a few tests such as uploading an image in the stock WP media gallery and it worked fine. I then made a separate custom field group without any repeater fields and just an upload image button and tried editng a post it was set to show on but once again I could not upload or even choose any image.