Hi anyone out there that may be reading this.
If you have just installed version 1.7 of Simple Share Buttons Adder, please remove and replace with 1.8.
Although stable when logged in, if you log out you shall not be greeted with the login screen.
A silly mistake of mine, totally stable if you stay logged in but obviously that's no good!
1.8 should solve your trouble, please do get in touch if you have any problems.