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I have same problems and tried to find what was the problem. There was no problem using only one monitor, but I could not log in normally when...
When I checked "displays have separate spaces" at Mission Control of OSX (ver. 10.11.6), No problem was generated. But, after uncheck "displays...
Also, I have same problem after Parallels 12 and hot fix 12.0.1-41296. I can't use my external monitor at the same time on full screen mode.