Ocsav, thanks for the reply, but, alas, no go. I can cd to all directories from /usr to /usr/share/fritzing/fritzing-parts. If fact, that was one of the first steps I verified, but I just did it again to be certain.
Also tried chmod u+s Fritzing for the executable: /usr/share/fritzing/Fritzing Again, no go.
At this point, I'm giving up on installing in /usr/share and am going to drop back to installing in and running from a local directory.