Well, tried it again today and it doesn't do it now. So not sure what I did differently this time, but since it's only did it that first time after installing, won't worry about it unless it becomes a more serious problem later. At least you've had other reports and it's known to be fixed in version 9 now.
If I happen to see it again and can reproduce the behavior will let Wolfram support know what I find.
On Sat, Mar 16, 2013 at 2:08 PM, John Fultz <firstname.lastname@example.org> wrote:
> We had a bug report on this in-house (for the Mac version only, I should > note), and for a long time had trouble reproducing it. We finally were > able to reproduce it in certain cases by opening Mathematica by > double-clicking on certain notebooks, and we believe the problem has been > completely fixed in v9. No new reports have come in against v9. > > But, looking back in the history of the bug report, it looks like there > were several cases where, for some users, the specific trigger for the > behavior could never be properly ascertained, even though we were able to > identify the bad state Mathematica ultimately entered that disabled the > Quit item. So, I'd say that if you're launching Mathematica by > double-clicking on a notebook, try not doing that. But possibly that's not > what you're doing, in which case I'm not sure that I have much good advice > to offer in the way of a workaround. > > John Fultz > email@example.com > User Interface Group > Wolfram Research, Inc. > > > > On Mar 16, 2013, at 2:13 AM, Bob <firstname.lastname@example.org> wrote: > > > I just installed Mathematica 8.0.4 on OS X Mountain Lion and noticed > > that when I run it (without any apparent problems), now the "Quit > > Mathematica" is greyed out and won't let me exit out of Mathematica. > > Any ideas or suggestions? I can always force quit it, but really hate > > to in case it causes problems. > > > > Thanks very much... > > > > -Bob > > > >