I just updated my message plus app the other day on 3 galaxy phones. 2 are S3's and 1 S5. and now my MMS messages will not download.I uninstalled the update on the S5 and everything works fine. You can't uninstall just the update on the S3 so I did a full uninstall then reinstalled it and still the same problem. If I go to the default android message app everything works fine.