Go to your Google plus account (google account basically), go to the upper right hand side where your account picture is and click the drop down to find “account -- privacy” then here you click on:
then you should see a new page with this:
personal info security language data tools account history help
Here i click on:
Now in the middle / down of the screen you should see:
Apps and websites View all
So here you click on this
VIEW ALL that is next to " app and websites ".
and then here you should see the pix-star app listed.
Then click on it, then on the RIGHT click on
REVOKE THIS APP
Then go back to www.pix-star.com and it should work.