Opening browser and logging in outside of loop

How do I open a browser and log in outside of a loop and then work within the browser within a loop. When I have tried this using Open Browser and then Attach Browser (also tried with Navigate To) I have issues with it still wanting to log me in again each time. Is there a way around this? The url is the same whether login is required or not, thus I am struggling with this.

@rbran - tried using a browser variable in the Open and Attach activities?
Not sure if this would impact, but I will try with unchecking the “Start New Session” checkbox in Open.