Nougat Dec Patch
It appears that the new Nougat Dec patch is not compatable with this app. Breaks both data and wi-fi.
I have been using this app for some time, but won't have Nougat until sometime next month I think. The first thing I would do, is go through all settings to see if something was moved back to default by the update. Especially Google settings. But permissions would be the next thing to look at too. Also, it could be something specific to the device OEM you are using.
Could you check thing out, and maybe let us know more about your device, software version and patch level? I just got an update to November 1st patch level back on the 12 th of December, and it broke several of my apps on Sprint HTC m9. Coincidentally, data monitoring apps, to be more specific. But, I'm using Block this as I type, and it's working just fine. I would be interested to know what steps you have taken to try and resolve the issue. Any information would be appreciated. Thanks.