I use "itsycal" as a menubar item to show me upcoming calendar events.
Since this beta, the menubar icon has finally stuck in the right place (i.e. it loads next to the clock, which is where I want it) instead of resetting itself to the left-most icon position each time I reboot.
As an aside, installing the second attempt of this beta (the "minor update" referred to in the post above mine) caused my iCloud account to lock. I had to unlock it and reset the password (and hence log back in to FaceTime, iMessage etc on all my devices).
Adrian, I am seeing a similar issue. May I ask what you did precisely to "unlock your iCloud account"? Thanks.