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When I shut down my MacBook (Mid-2010 13" Unibody), It hangs for a minute or so and then displays the message that Backupd-helper is preventing shutdown. The only way I can shut down is holding down the power button for a couple of seconds before it powers down.
This started happening after I update to 10.8.1
MacBook, OS X Mountain Lion (10.8.1)
I have the same problem on my MacBook Air. The only way a get it to shut down is by opening force quit and quitting Backupd-helper first.
Same problem. I have a late 2011 i7 macbook running 10.8.1. With Safari running, I close the lid to sleep it and that's where I think my problem starts. After I open it, I will press command-option-esc to bring up force quit, and there it is! Backupd-helper
I don't like weird stuff happening on my brand new machine so I took drastic action, as suggested on another thread dealing with shutdown problems. I did a complete reinstall of 10.8.1 from a usb stick. I wiped my drive, twice. Then I reinstalled the os and brought my mac back to life. Basically back to square one when I originally uprgraded from 10.7. (I've read that's the best way to install the OS, from a usb stick doing a drive wipe.)
The same problem occurred after I wiped the drive and reinstalled everything. Same exact thing with sleeping, safari, etc.
My fix is to check the force quit dialogue before shutting down. Hmmm, that's silly seeing as 10.8 is excellent and fast. 10.8.2 ?
Backupd-helper is preventing shutdown.
