Apple has released OS X Mountain Lion 10.8.5 Supplemental Update with a couple of sleep-related fixes, including a bug that could cause external drives to be ejected after your Mac goes to sleep and a problem that prevented HDMI audio from working after wake from sleep. The supplemental update also fixes an issue that prevented some applications from accessing the FaceTime HD camera on mid-2013 MacBook Air models and a bug with USB Bluetooth adapters. It’s available as a direct download from Apple’s Support Downloads Web page or via the Mac App Store. (Free update, 18.7 MB)
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
OS X Mountain Lion 10.8.5 Supplemental Update
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Special thanks to Ronald Gehrmann, David Talley, Larry, and Charles
Eimermann for their generous support!