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I have an odd question that (while it doesn't stop progress) is fairly annoying. Here's what I do. Shift + A -> Mesh -> UV Sphere. Pretty straight forward right? Well, once the sphere is created the options are disabled. The only couple of addons that I've installed have been Ice Tools and Retopoflow. I also downloaded 2.78b (I was in 2.78) and I'm having the same issues. I assume it may be in the saved preferences?

enter image description here

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  • $\begingroup$ Yes, it's likely caused by the User Prefs, enable the Global Undo. $\endgroup$
    – Mr Zak
    Feb 26, 2017 at 16:02
  • $\begingroup$ Thank you and that worked. Do you happen to know why that happens? $\endgroup$
    – probie
    Feb 26, 2017 at 16:51
  • $\begingroup$ It's described pretty well in the linked answer - blender.stackexchange.com/a/2155/1245. In short Blender has to have access to redo history as it undoes one action and redoes it with new parameters when changing options in the Last Operator Panel. $\endgroup$
    – Mr Zak
    Feb 26, 2017 at 18:26

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