Firefox Login issue

BP 1.2.8

Issue with BP login in firefox, when logging in from main page my users just get looped back to the main page as if not logged in unless they refresh the page completely then it shows logged in.

further more when a user navigates to another page suddenly they are logged in, if they go back to the main page they look logged out but again navigating to another page puts them logged in again.

I need a work around, I have installed the BP redirect to profile plugin and that solved part of the problem, but still when a user goes back to the home page or our videos page they are seemingly logged out until they navigate to another page or refresh again… so confused.

I have enabled the buddypress default theme and am still having the same issue.

any suggestions?