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I have an problem with my MacBook. The Dock disappears suddenly / Activity Monitor flashes and then disappears.

  1. I have tried to setup a new user login, it does't work.
  2. Downloads and documents are also deleted in the finder left navigation.

In the top bar, my Username is not aligned to the tool bar, it has moved a little upwards in comparison.

I have tried to these ideas; they did not work.

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Are there are any relevant messages in Console.app? I had a similar problem where different processes crashed on launch, but I fixed it by doing an upgrade install from the recovery partition. –  Lauri Ranta May 2 '13 at 13:30
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