Word 6’s Smart Cut and Paste feature is supposed to make life simpler. When you insert or delete a word with Smart Cut and Paste turned on, Word also automatically either adds or removes the spaces surrounding the word as needed, saving you the trouble having to press the spacebar or the Delete key to maintain proper word spacing.
This is usually a handy feature. But we love the Delete Previous Word command (Command-Delete), which deletes the whole word just to the left of the insertion point. Problem is, with Smart Cut and Paste turned on, this command also deletes the space along with the previous word, forcing us to press the spacebar again before continuing our typing — trivial to you, perhaps, but a major annoyance to us former Word 5 maniacs.
The answer for us, of course, was simply to turn off Smart Cut and Paste by deselecting its check box in the Options dialog box (choose Options from the Tools menu).