A
Thank you and welcome as a new member.Just wanted to add... I came here with the same problem. Also started after updating. I'm not an expert, but I know a little bit, and I'm fairly certain it isn't malware. I think it has to do with the carrier.
I also only use mine over wifi. Its not connected to a plan. I think it's trying to connect to Verizon and failing. There is no DDR app listed under Apps, and I don't have anything listed that I don't know what it is.
Clearing the cache didn't help, but I'm able to use the task switching button to go to Google Now Launcher and use my phone like normal. Once I hit the home button, it goes back to the DDR app screen, and I have to switch back to Google Now Launcher. The DDR App screen doesn't show up in the open apps list either.
Sorry for the novel, just wanted to provide more info.
I'm not an expert, but I know a little bit, and I'm fairly certain it isn't malware. I think it has to do with the carrier.