Do you need 7.1?
I have had similar problems, you should only run as new a PHP version as you need to run the programs you are using.
If not you should be able to roll it back in your Cpanel. I think your host can even roll it back for certain programs. You could ask them.
I am probably going to abandon this plugin too
By the way, I don't know nut'in, so hopefully someone else will give you better help!