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For some reason, when i resume my Lenovo machine running Windows 7 after hibernation, all of my programs that were open, have all closed.

I was under the impression that hibernation takes a snapshot of your RAM and just resumes the session on wake?

I think this may be a recent issue, meaning it could be to do with a recent update?

I couldn't find any useful information around the web, hence the question.

The only restore points on my PC are from 2 days ago, from a Critical Update and I believe the issue has been occurring longer than that.

Any help is appreciated!

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Maybe there is a limit to the size of the hibernate file? Is the size of the hibernate file the same as your RAM size? –  David Dai Nov 21 '13 at 8:50
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Is it really hibernating? I don't recall specific message, but is it showing Resuming from hibernation ? message at logon screen? See System log to confirm if it's resuming. –  week Nov 21 '13 at 9:31
    
It definitely sounds like either your are not hibernating at all, or the hibernation file is getting corrupted and deleted, or possibly even something is preventing from the hibernation process from completing correctly. You’ll need to provide some more information/feedback to diagnose this. –  Synetech Dec 28 '13 at 1:35

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