Parallels does not detect OpenOffice.org.app as a shared Mac application any more. After a while, I finally had the idea to rename OpenOffice.org.app to OpenOffice.app (without the .org), and after a new "Populate", it finally worked. It seems as if the application would not be recognized because of the additonal dot in the application's name. This seems to be a new bug introduced in the latest build. Also filed as report #251963.