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Blank window pops up, then disappears ...

  • Version: 39.0.2256.71 - Opera is up to date
    Update stream: Stable
    System: Ubuntu 16.04.1 LTS (x86_64; Unity)

    Using one window, every 10-15 minutes or so a small blank "pop-up" window opens - is totally blank with no webaddress - then closes after 1-2 seconds.

    haven't made any changes. Standard UFW firewall, no intrusions. Ubuntu is A-Okay.

    Extensions installed are:
    Version 2.57

    Black Menu for Google™
    Version 11.0.6

    Version 5.4.10

    Google Calendar
    Version 3.1.1

    HTTPS Everywhere
    Version 2016.9.1

    I don't care about cookies
    Version 2.5.9

    NoScript Suite Lite
    Version 0.2.1

    Version 3.0.0

    Any ideas? Thanks!

  • Try to uncheck "Use hardware acceleration when available" .