Cannot open Identity Safe

I have not been able to sign in to my Identity safe Vault.  It asks me to sign-in, which i do, then it brings me back to the sign in prompt again.

The browser i use is Google Chrome and Windows 10

I have 4 HP desktops all using the same version of Norton 360 Premier, Windows 10 and Chrome. Three operate normally but the 4th will not allow me to open my vault.

I have tried deleting my Norton 360 Premier and reinstalling it with no results and have run live update and a complete scan, again, no results.

Please?