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This question already has an answer here:

I don't know what I pressed, but this happened before.

  1. I can't undo or redo in object mode but it still works in edit mode.
  2. When I move an object to another layer I need to press an "OK" button.
  3. Can't use the lower half of the left toolbar in object mode, it is grayed out.

Here are a couple pictures:

enter image description here

enter image description here

What is causing this strange behavior?

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marked as duplicate by sambler, user7952, VRM, someonewithpc, Ray Mairlot Jan 4 '15 at 14:02

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