3.5.1 Media Library has reverted to old Media Library

I’m running 3.5.1 and I’ve been using the upgraded media library and loving it. I used it earlier today and then I turned on the slider that comes when the theme and it stopped working and reverted back to the old. The new media setup was working once I turned the slider on and was uploading files to the slider but then I went to use it later and the media library had reverted back to the old setup.