Word cannot undo an operation error

With the implementation of the OFFICE365 project, the user feedback to the is about office use of the problem is also very much, such as: Word2013, so found a strange problem, the Undo button is always gray. The editor flashes and turns gray again. Pressing CTRL-Z also doesn't work. Chinese resources inside the solution is to use Winword.exe/safe to start once, and then enter word to return to normal, but this method is not once and for all. I looked up the English resources and found a way to change the registration form.

Close all programs that are running.

Press Win-r, type regedit in the Run box, and then click OK.

In Registry Editor, expand to the following registry subkey:

Microsoft Office Word 2013

Hkey_current_usersoftwaremicrosoftoffice15.0wordoptions

On the Edit menu, point to New, and then click DWORD Value. Select New Value #1, type undohistory, and then press Enter.

On the Edit menu, click Modify.

In the Edit DWORD Value dialog box, click Decimal under Cardinality. Type a value between 0 and 100 in the Value box, click OK, and then exit Registry Editor. This value is the number of undo, not recommended set too large, generally set to 10 can be. Too assembly consumes more memory resources.

Start Word. Word stores the undo history in the number of actions that you specified in step 6.

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