I upgraded today:
MacBook Pro early 2013
Using a USB 3.0 SIIG Beyond HD device powered by displaylink as one of two additional displays, 3 in all.
The display link screen displays but is not functional. windows ghost when moved to the screen (they are there but not visible). When selecting display all windows the window appears but when you move it back to one of the other two screens part of the image of the window remains on the display link screen.
Menu bar menus highlight but the drop down menu does not appear.
I'm guessing displaylink didn't test under the beta or didn't finish prior to production release.
The third display on my MacBook Pro is for the most part not functional
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