Mac OS X 10.5 Leopard is great, but as any other OS, it has it’s growing pains.
Here’s issues I encountered with it:
1. MailActOn doesn’t work with new Mail.app
UPDATE: The Leopard install has been released. Works great.
2. When starting Terminal.app I got this error message:
“You are not authorized to run this application. The administrator has set your shell to an illegal value.”
I downloaded iTerm from http://iterm.sourceforge.net/ and issued a command:
sudo chsh -s /bin/bash my_username
That fixed it.

Hatem Nassrat
April 11, 2009 at 1:00 pm
I am using tiger, an I found this problem. I am an iTerm user, but I found its annoyingly slow with their latest update, its eating up all my CPU !!!.
Anyways, I found that Terminal.app will not run and will give the anoying:
“The administrator has set your shell to an illegal value”
Message if the shell is set to anything other than /bin/bash. Since I installed bash 3.2 using fink, I was using /usr/bin/bash (which is a symlink to /sw/bin/bash). So what I did to fix this was (of course using iterm, since term doesnt open).
sudo mv /bin/bash{,.old}
sudo ln -s /usr/bin/bash /bin/bash
Then I went into “NetInfo Manager” and changed my shell back to “/bin/bash”, and everything is cool again.
I am not sure when this issue started apparing, since I was using iTerm, but I am suspecting this was brooken in some Apple updae of some sort.
Tim Moses (@timmoses)
September 27, 2011 at 2:59 pm
Thanks! I also got the “You are not authorized to run this application” error for Terminal, but in Lion. I downloaded iTerm and ran the command you suggested and that fixed it.
Bmeister1996
October 9, 2011 at 4:01 pm
This didn’t work for me… I used iTerm and pasted the command into it and it first said “I have no name!$” then it simply didn’t work… suggestions?
Tim Moses (@timmoses)
October 14, 2011 at 3:08 pm
I just updated to 10.7.2 and ran into the problem you mentioned. I repaired disk permissions in Disk Utility and now I can log into Terminal. At the same time, I was converting from MobileMe to iCloud. I doubt that would have any effect, but you never know.