I have the DRM problem. I have the same ZTE phone. The problem was noticed about a month ago. About that time, a message popped up to install the update for Google photos. I just did the update(from the play store) today, 8.26.15, and I uploaded the photos directly to the USB port of my computer. I noticed that all my photos now seem to be uploaded to Google photos.
This may or may not be the solution. Also my SD card was "corrupted and I was directed to reformat the card". The file manager showed nothing on the SD card. After only reinstalling the card, the message did not come back. The phone does not recognize the card. Maybe coincidental. Good luck.
Greg