Just updated to the 3.0 beta. Everything appears to be working OK. I have 2 displays now in my "normal" setup using DisplayLink in addition to the 28" Thunderbolt connected display, for a total of 4 displays. I am anxiously awaiting macOS Sierra 10.12.2 that is reputed to fix the black areas when moving windows.
I will update you if I see anything odd.
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