Annoying weirdness that crops up from time to time:
I click my CH bookmark (which opens to the most recent threads on all forums). Occasionally I forget to sign in, and just click on a thread. Then I notice I'm not signed in, click the back button, and sign in. When I then click on the thread I was looking at before signing in, hey presto, I'm again not signed in.
Second scenario, similar but different: I'm looking at a thread, and notice I'm not signed in. I sign in while still in the thread, then click the back button to get back to the "most recent threads", where I started. Again, become "unsigned-in".
What to do? Am I missing something obvious here? Current FF browser, BTW.