OK, from this description, I'm guessing that you have never seen the "animated" contents of the "monitor" in the Screen Saver panel.
When I do what you are describing, the "monitor" within the Screen Saver panel first shows the MA3 logo, and then the fish appear and start swimming around (a miniature version of the simulation). You may not have seen either of those things. What (if anything) is shown on that "monitor"?
I'm also guessing that if you have your Screen Saver set to something else, and go to that panel, and then change it to MA3 (without clicking "apply"), that you get the same crash.
If those things are true, there might be enough "clue" for Jim to fix it.
Yes you are correct. All of the above is true. I never see anything but a black screen in the "monitor" section of the screen saver panel.
Thanks
Bill