Thanks for the ideas. I ran the Specs test, and got some interesting results. First, the Specs instance ran and created a blank window, as before. No indications of versions of different PGraphicsOpenGL variables as expected. This caused me to think that something is wrong with how the library draws. So I switched the println()'s as above to System.out.println(), and still nothing (in console or frame).
I moved the System.out.println()'s to the settings() method, and it produced all nulls:
null
null
null
null
null
So I set a breakpoint on the draw( ) method and discovered the method is never reached when using the P3D, but it is called repeatedly for 2D graphics (two arguments to size() method).
All of this is after again uninstalling Eclipse and reinstalling, but this time using a clean .settings folder (on my desktop).
Any further ideas?