Why are my location pins disappearing and reappearing?
When I click on a view to my photos I get this
Notice that there are no pins in the film strip, while the location is obviously in the selected file as the map on the left in the info box shows, and the text on the large map shows.
Then I double click the picture in question.
And double click again
this time the pins are correctly displayed showing that they do have location information.
Aperture 2, OS X Mountain Lion (10.8.2), with aperture 3 upgrade disk