I got 'Storage optimize Mac', the value of preferences so all of my original pictures must be in iCloud. I don't immediately panic, because I assumed that they would gradually repopulate for a little while. The photos in question were display in miniature (or 'moments') view as pale gray rectangles with a cloud icon in their breast. The first time I launched the Photos app after the upgrade, I got the usual message on photo library updated, but when that reaches 100%, I noticed that he was missing a large number of thumbnails in my library. I have improved my mid 2010 MacBook Pro for macOS Sierra September 21. Photos for Mac behaves VERY strangely since the upgrade to Sierra Do NOT click on the reset button on the startup window Mode safe.Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance.Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem. I reinstalled FF, but they aren't there yet. Shortly after I installed Windows 10, Restore Down/Full screen minimize and close buttons are gone. Reduce the buttons and full-screen are missing since the upgrade to Windows 10.

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