After opening DU, then opening another tab, then deciding to login, DU, unlike any other site I have used,

[Wonder Why]

doesn't recognize in the second tab that I have logged in.

So, run DU. Not logged in. Open a page in a new tab, not logged in.

Login on yet a third page. Shown as logged in on that tab.

Go back to second or first tab. Click on link to reply to that discussion. Wants me to log in (because it doesn't reread cookies?)

Refreshing the page that failed now shows I am logged in and works fine.

In any other site, If I login on a new tab, the original tab does not show I am logged in but clicking on a link or selecting an option from pull-down menu works because it now shows me logged in on that tab.

Similarly, If I open a tab before logging in, then selecting "Recommend" to post, It takes me to login screen in same tab. If I then login, I am showed that. However, if I backup to the post where I started, then select Recommend, I get

You are already signed in

You cannot sign in because you are already signed in.

Again, I have to refresh that original screen to allow me to continue. So hitting the Recommend button knows I am logged in but thinks I want to login rather than do the Recommend.

I run Firefox on Linux and this has long been a problem. Again, no other site exhibits this behavior except DU. Every other site instantly recognizes the correct current state (that I am logged in) and the step that I want to accomplish. It seems DU is the only one that does not auto-refresh when login status has changed.