I had the same problem, and it was mainly because of problems of compiz and nvidia-current (the proprietary driver) not talking to each other properly.
Try to uninstall nvidia-current (or any other version of the proprietary driver) and reboot:
Code:
sudo apt-get remove nvidia-current
Then, on the next system initialization, the opensource nouveau driver will load, and for me it works well with unity. I believe (and this is only a guess) that this problem may be solved with the release of the upcoming 285 version of the binary drivers...
I hope this solves your issue
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