Mac Pro Wake issue
With so many having the same issue, I'm sure Apple is well on it way to finding a fix.
My system only has issues when I use large amounts of memory (multiple applications or pictures open) when the system goes to sleep. When I wake via space bar voila, it restarts. To stop the issue I cleared Pram or stopped putting my system to sleep. You can clear Pram by holding down the "Apple" key, the "option"key, the letter "p" and the letter "r" keys simultaneously while you power on. You can tell if your are successful by holding the keys until you hear two boot chimes. I have called Apple and submitted this info. They tell me engineering is working on the issue. Hopefully my info helped.
Ben