Identical description for me as well... that's what betas are all about, they say. Let's hope we have a fix sooner than to expect another beta release, maybe a patch file, a workaround or even a new version of the same beta.
IgnacioAF
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
As a workaround, I installed Beta 6 (complete pkg) over beta 8 to restore my display use. I guess the solution will be in the next beta (9).
Beta 9, released today (Wednesday, October 6th), apparently resolved all this issue. I just installed it over Beta 6 and everything went ok.