I don't know what the time scale is when you log us out of the forums.
But if you only visit the forums maybe once a week, and I've been logged out.
When you get redirected to My ETC I'm already logged in. So I've discovered I need to log myself out and then back in to get the forums to see me logged in. If I don't log out just go back to the forums it still has me logged out.
As we work to track this down, if you are seeing it, can you please post the time/date you're seeing it (after logging back in obviously) and your browser version in this thread?
I was able to sign in to the forums without issue, but MyETC was blank until I signed out and in again today. Chrome like Noah. Version 79.0.3945.130 (Official Build) (64-bit)
Around 12.16.
Mac OSX High Sierra, using Safari