Hi
I'd like to extend you a warm welcome to the Community Forum. I hope you find it a valuable resource.
When you have the company file open, could you please go to Help > About, does it show the product version as v2017.1.1? If it's still showing v2016.x, please do look for a new shortcut on your Desktop, for 2017.1.
Once you use the 2017.1 shortcut to launch AccountRight and open the company file, please use Payroll > Load Payroll Tax Tables, then check the tax table revision date again, it shall show 1/7/2017.
Please do let us know how you go.