grichter, did you notice that the Mac installer skips right past the Destination step and doesn't let you choose where to install? It automatically installs to the Applications folder even if PP2012 is installed somewhere else.

Thus there is a partial install (with a new PP2012 app and a few new runtime files) in Applications and my original full install, not iupdated, in a different place. I manually copied the new stuff into the original installation folder, replacing where necessary. I suspect somehow in there I lost the library.

I will probably have to move my original install to where the updater expects it to be. Because the updater doesn't seem to know there IS no Poser where it is installing the new files. It's creating a new Poser 2012 folder and a new, very incomplete runtime.