The sign in box every time I boot up has also went away for me with this latest update. Hurrah!
But I also now have the "Admin rights required..." message popup every time I restart the Mac. Ugh! The message pops up and displays for a few seconds and then fades but it popups again after about 10-20 seconds. Of course I would try to click it as I'm used to interacting with messages displaying errors on my computers. When I was able to click it before it faded the "Sign in" window would appear and now I'm back to having to sign in again everyday but now I have to click the popup to get the sign in window to appear. So it looked like they fixed it, kinda sorta not really.
BUT... today I booted up and received a call right away and I noticed the "Admin Rights..." popup and disappear about 6 times or so, as I was busy I didn't interact with it... and it finally just stopped appearing. I clicked the CC panel and it opened up fine, no login required. So even though it seems counter-intuitive NOT to interact with an error message that keeps popping up on your screen I recommend ignoring it and it might go away after a couple of minutes and log you in just fine.
Adobe magic!