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When I select multiple objects a sticky note appears
Selecting multiple objects with the shift key opens green sticky notes.
Acrobat XI has a new feature called "Output Preview Sticky Notes" which results in green sticky notes being added to the file when you shift-click to select multiple objects while the Output Preview is open. The use of the shift key while this window is open overrides the PitStop functionality of multiple selections.
Close the Output Preview window to enable multiple selections with the PitStop Pro selection tool.