I think the trigger is your desktop size: 2560x1600 and 1920x1080 And therefore the real bug is probably bug 1064834.
Please test reducing your desktop to a single monitor, briefly. Does that help?
Either way, please try the fix proposed in bug 1064834: https://bugs.launchpad.net/unity/+bug/1064834/comments/7
I think the trigger is your desktop size: 2560x1600 and 1920x1080
And therefore the real bug is probably bug 1064834.
Please test reducing your desktop to a single monitor, briefly. Does that help?
Either way, please try the fix proposed in bug 1064834: /bugs.launchpad .net/unity/ +bug/1064834/ comments/ 7
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