I keep getting the yellow 'Join Up' button at top right while signed in (with no 'Sign In' button beside it). It doesn't let me post or up/downvote posts when it does this, and when I click 'Join Up' it tells me I'm signed in with Xbox Live and gives me an option to continue.
This kicks me back to the main Forums page signed in proper, but most of the time if I open a thread to participate in it, it goes back to 'Join Up' and not letting me do anything.
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This should be fixed now. A JS error cropped up yesterday morning. We were able to hotfix it today.