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Tom --
The Undo button is grayed out until you complete an undoable actions, such as changing a task Duration value. If you change a Duration value, is the Undo button now enabled? Keep in mind that not all actions are undoable, such as changing certain values in the Project Options dialog. Also keep in mind that when you click the Save button, the Undo cache is flushed, which makes the Undo button grayed out until you perform the next undoable action. Please let us know if changing a task Duration enables the Undo button and we will try to help you.