"Large" images not generating

  • When uploading an image to the Media Library, only the thumbnail, medium, and post-thumbnail (defined by the theme) are generating; no “large” size is created. My media settings are set to:
    Thumbnail: 150 x 150 pixels
    Medium: 300 x 300 pixels
    Large: 1000 x 1000 pixels
    The image I’ve been trying to upload is 1984 x 1400 pixels.

    Error log is returning the message:
    PHP Notice: ob_end_flush(): failed to send buffer of zlib output compression (0) in .../wp-includes/functions.php on line 3549

    I’ve got the Workality Plus 2.0.1 theme installed, using WordPress 4.5.1, no plugins are activated. I’ve read about a disabled/missing PHP GD library causing issues like this, but I checked and I have it enabled. What could be preventing the “large” size from generating?

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