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I had the same problem after updating to crimson drivers. The solution (for me) was to hit Win-P and click "extend". After that it worked like it used to. It seems something about the AMD install switched the setting to "second screen only".
Wow, such a simple solution and worked great, thanks alot!
My problem is very similar except that i need to be able to set a preferred display for programs to default to. I have a 3 monitor eyefinity setup and a 55" TV on HDMI that i sometimes throw games onto. The option for setting preferred display goes is not visible when i extend the desktops and while running eyefinity it now doesnt even run my TV at the same time. Acts like it can only run 3 at once now unless they are extended desktops with eyefinity disabled.
I am about to downgrade to the 15.11.1 beta drivers until this stupid crap is figured out.
Side note...i see that my original eyefinity preferred display default is there even though my options are gone to change it to something else.