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I think I may have hidden one of my favorite transitions and don't know how to unhide it in PD 21. Anyway it is not in my transition room. The transition is named "center"
If you did hide it, in PD21 under the "All Content" transition window, right click in a stipple area(not on a transition), you should see "Unhide All". Search for transition and see if that brings it back.
Jeff