Thanks, JohnWilson, for your reply. I'm trying to avoid going through the "Compare" process every time I open the document. I'm trying to create a document that I can open any time--or share with others--that immediately shows me what changes have been made. In MS Word, it's possible to share documents with the tracked changes showing. Maybe I'm expecting too much from PowerPoint. I'm beginning to think that the Revisions pane is visible only after going through the "Compare" process, and it's necessary to do that every time I open the documents.

The reason I want this is because someone else has to enter my changes from PowerPoint A into PowerPoint B, which is similar to but not identical to A. If I have to compare the two presentations, I will get a lot of false changes, obscuring the changes that I really want to highlight.