I use SonataMediaBundle with SonataAdminBundle with a simple install.
When i want to add a new media. I can select what provider i want. I configured it to show Daylimotion, Youtube and Image.
The Youtube and Image picture doesn't appears. I can see the error
GET http://my_url/web/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAOcA…/kI5CVlcXzqGKBtUyZMjz8qd9WApPTb0NUnhAgBPwh8D8I22yw4XkRvwAAAABJRU5ErkJggg== 414 (Request-URI Too Long)
Second problem come when i upload an image. I got:
request failed: URI too long (longer than 8190)
I try the js i found at http://sonata-project.org/bundles/admin/master/doc/reference/troubleshooting.html but it doesn't work.
Edit: I change my SonataMediaBundle version from 2.3 to dev-master. Now i can see the youtube logo but still have the too long uri error.