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

Why is it not working and how can I fix it?

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    $\begingroup$ Basically, SHIFT + ALT toggles between being able to undo/redo and... NOT being able to undo/redo. That's all. $\endgroup$
    – user18695
    Commented Apr 19, 2017 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
    Commented Apr 19, 2017 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
    Commented Apr 19, 2017 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 ♦
    Commented Apr 19, 2017 at 22:55
  • $\begingroup$ @Duarte Thanks for making my comment a little more understandable :) $\endgroup$
    – 3fingeredfrog
    Commented Apr 20, 2017 at 19:54

4 Answers 4

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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 at Superuser question How to avoid keyboard layout automatically changing on windows?.

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 at he answer How to disable Ctrl+Shift keyboard layout switch (for the same input language) in Windows?

Under the Windows Control Panel > Regional and Language Options > Languages tab see Details...

There, you can edit the hotkeys to change input languages. If you press the Change Key Sequence... button, you can disable the hotkey which switches keyboard layouts.

Credit goes to 3fingeredfrog for the explanation

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I had the same problem, but in my case wasn't by an key combination.

If other answers didn't solve problem go to the Blender Users Preferences > Edit > Activate Global Undo (optionally add more steps if you want).

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For Mac, it is solved by hitting ⇧ Shift + Option

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⌃ Ctrl + ⌥ Alt + U > Preference > System > Memory and limits > Global undo

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