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Must be Windows 7, since 8.1 and 10 don't support transparency.
@sgunhouse My computer is win 7 ultimate, why?
Only Vista and 7 have transparent title bars. And Opera no longer supports Vista.
@sgunhouse What should I do to keep it don't be transparency?
I don't think there is something you can do. Maybe changing Windows theme/colors? Maybe disabling Aero?