I downloaded Bluestacks and rooted it again, now I’m fine. ^^
But a new problem is there:
Start -> regedit -> ComputerHKEY_LOCAL_MACHINESOFTWAREBlueStacksGuestsAndroidFrameBuffer
Change GuestHeight and GuestWidth (make sure to check “decimal” when changing a value) to 410×683 to
I did and now Duelit makes Bluestack so small that I can’t see it.