Onyx and DU are both just the front end for the repair permissions program built into the OS. When you use Onyx to repair permissions, it's just flipping the same switch that disk utility does. It doesn't do anything special on its own. You have an SSD, everything is a boatload faster.
We need to take a look at the Console log, All Messages, at the exact time you try to log out. Make a note of the time exactly on the system clock, seconds too, that you hit log out. Give it 10 minutes exactly, then power down if needed. Either copy/paste the log to me in a PM, or call and I can remote in to read them.
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