From the Start menu, choose Settings > System > Power & Sleep.
Versions affected
Lightroom 3.3 and 3.4
We are aware of this issue and are working on a fix.
In the meantime, you can change the sleep settings on your system to avoid this problem:
From the Start menu, choose Settings > System > Power & Sleep.
Change the sleep setting to Never.
From the Apple menu, choose System Preferences > Energy Saver.
Change the Turn display off after setting to Never.
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