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I have a strange issue with my MacBook Pro (6,2 OS X 10.6.8). When I leave the laptop for some time, let's say 30 minutes, I find only the log in screen.

I think it did not reboot. It just logged me off. Luckily some programs reject to be closed (that's annoying too, but different story) an I find a dialog that tells me application X prevented logout.

I am aware of the system setting to automatically log the user off. It is not active. I checked the GUI a hundred times.

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@slhck Thanks for embedding the image – Roman Oct 11 '12 at 14:32
up vote 2 down vote accepted

You might have run into a weird bug here. For the time being, you could set the "Log out after x minutes of inactivity" to a really high number or you could download this little utility named caffeine, which prevents your Mac from going in to sleep for a specified time (including "infinity"):

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+1 for Caffeine, I use it every day... it only seems tangentially related to this problem, though. – jrajav Oct 6 '12 at 13:50
Just when I thought my macbook finally got some self healing capabilities - it happened again. Will have a look and report back soon. – Roman Oct 11 '12 at 14:33
Seems to work till now. Thanks – Roman Oct 29 '12 at 11:12

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