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My mac pro restarts when waking from sleep

Answers: Have 9 answers
Hello everyone pls help me.
I have a annoying problem and that is that my Mac Pro restarts after it has been to sleep.
Last week I updated the system with an update from Apple, safteyupdate 2013-003 version 1.0.
I have swedish OsX 10.6.8.
After this update my mac always restarts after waking from sleep.
So what may have gone wrong?
Pls help me in a simple way, and pls describe in easy steps if I have to do something.
The best answer: One suggestion is to always have cloned your system ahead of time, that means before making changes or updates, early on when it is fresh and working.
And don't just restart. Use Safe Mode at least, better yet use Recovery Mode if on Lion (which I do recommend) and have a small OS Emergency drive for any maintenance - along with a clone working copy of your system.
Don't just reinstall over your system. Do a fresh install on another drive. Image it and set that for maintenance, then clone that to be a new working base for your system.
Setup Assistant does an amazing job.
Forced restarts can corrupt the filesystem and directory as the changes in memory or cache are not written out and drives are not unmounted properly and will come to bite in the rear.
Using Cloning as a Backup Strategy
Create an OS X Lion Install disc
OS X Lion Install to Different Drive 
How to create an OS X Lion installation disc MacFixIt
Migration Assistant Update for Mac OS X Snow Leopard
http://reviews.cnet.com/8301-13727_7-20080989-263/how-to-create-an-os-x-lion-ins tallation-disc
http://www.coolestguyplanettech.com/how-to-make-a-bootable-osx-10-8-mountain-lio n-disc-or-drive-from-the-downloaded-mountain-lion-app/
How to clone your system:
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
General purpose Mac troubleshooting guide:
Mac OS X: Starting up in Safe Mode - http://docs.info.apple.com/article.html?artnum=107393
What is Safe Boot, Safe Mode? (Mac OS X) - http://support.apple.com/kb/HT1564
Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems:
Isolating an issue by using another user account
Identifying resource hogs and other tips:
Using Activity Monitor to read System Memory and determine how much RAM is being used
Starting the computer in "safe mode":
Mac OS X: What is Safe Boot, Safe Mode?
To identify potential hardware problems:
Apple Hardware Test
General Mac maintenance:
Tips to keep your Mac in top form