I accidentally pressed some unknown key combination, and now I can't use Undo nor Redo in Blender

  • 1
    $\begingroup$ Basically, SHIFT + ALT toggles between being able to undo/redo and... NOT being able to undo/redo. That's all. $\endgroup$ – noClue Apr 19 '17 at 14:26
  • $\begingroup$ Can you clarify what you mean? Pressing Shift + Alt when? As far as I am aware there is no way to disable undo/redo. $\endgroup$ – Ray Mairlot Apr 19 '17 at 14:54
  • $\begingroup$ If you are using English Software (Blender) but an Azerty keyboard, accidentally hitting Shift + Alt keys toggles the keyboard to the Querty setup. This effectively "disables" the the Undo/Redo shortcuts. But of course they still work but now you need to use Ctrl + W to Undo instead of the usuall Crtl + Z. Or use Shft + Alt to toggle back to your usuall keyboard setup. $\endgroup$ – 3fingeredfrog Apr 19 '17 at 17:09
  • $\begingroup$ @3fingeredfrog That is indeed curious and useful information, unfortunately the way the question and answer are worded it is impossible to understand what you explained. Could you please edit them so they read more like your comment. $\endgroup$ – Duarte Farrajota Ramos Apr 19 '17 at 22:55
  • $\begingroup$ @Duarte Thanks for making my comment a little more understandable :) $\endgroup$ – 3fingeredfrog Apr 20 '17 at 19:54

If you are using English Software (Blender) under Windows based Operating Systems but with an AZERTY keyboard, accidentally hitting Shift+Alt keys toggles keyboard layouts, as explained here.

This apparently "disables" the Undo/Redo operators, when in fact what happens is it changes the keyboard shortcuts

Ofcourse they still work, but now you need to use Ctrl+W to Undo instead of the usuall Ctrl+Z, or use Shift+Alt to toggle back to your usual keyboard layout.

You can also disable the shortcut in the Regional Options of the control panel if you follow the steps described here

Credit goes to 3fingeredfrog for the explanation


Man, i passed by the same problem. But, in my case wasn't by an key combination. If this problem didn't be solved: Go to the Users Preferences (in blender) » Edit » Activate Global Undo (and add more steps if you want). Hope this help.


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