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Thanks for replying.

tlmgr update pgf did not, by itself, work (and who knew that to update a package called by "\usepackage{tikz}" you should update pgf?). :) But since tlmgr said that no pgf update was available, it occurred to me that maybe I do have a fully updated version. I looked back at ...

When I read Namrod's reply, I was hoping that System Preferences > Keyboard > Application Shortcuts would let me force TeXShop to open a "Do you really want to quit?" window every time I hit Command-Q. No such luck.

So, I guess this is a feature request for TeXShop: Can we put in such a confirm-to ...

A collaborator recently sent me a latex file that uses the package tikz. I couldn't compile it, and the .log file indicated that my tex distribution has a very old (2005) version of tikz. I used
tlmgr update --all
and found out I had to update my whole tex distribution. So I installed the newest ...