screensaver causes error "share does not exist on the server" to endless loop
OK, I got it  solved.  I first mounted the disk with the image files from it's new, permanent location on the server.  Then I opened iPhoto and slowly, image by image opened them.  The bulk of them opened with no problem from the new location.  A fair number, 100 or so out of 10,000, had lost their connection to the actual file.  Most of these I was able to locate on the hard drive and re-link with no problem.  A few, perhaps 20, I seem to have lost completely.  None of them were of much importance.  I allowed iPhoto to take it's time quitting so that it could update it's library etc. Now, even without that drive mounted to my desktop, the Screen Saver will start with a simple AppleScript and opening the Screen Saver control panel works with no trouble and does not spawn any error messages at all.