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Dragging window halts system

  • Opera 46.0.2597.26
    macOS 10.12.5

    13-inch 2017 MacBook Pro (without touch bar). This error has occurred when connected to a 4K monitor over HDMI.

    If I open a new Opera window and proceed to drag the window, the entire system will freeze. I can still move the mouse and any audio that is playing will continue to do so, however the entire system freezes and requires a forced restart by holding the power button.

    Checking the console there appears to be a lot of errors relating to UNIX Error 17 (which I believe is Keychain access), and system.log consistently shows the following information , though I am unsure if both of these are related.

    Any help would be appreciated.

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