Questor,

It looks like you have a permissions issue (perhaps among other things).  Did 
you install it as a different user than you are running it as? If so you might 
be able to "fix" it by changing the owner to your user in info. i.e. Select the 
app in the Finder, "File" > "Get Info", then in the bottom section of the info 
window there should be a gear with which you can "Make USER (me) the owner".

Anyway, this bug is now tracked at 
http://trac.sagemath.org/sage_trac/ticket/11755

In the end, it works for me (both terminal and notebook sessions) running it as 
the same user that I installed it.  My other thought would be that you got a 
corrupted download.  If you still have the disk image you can run 

md5 ~/Downloads/sage-4.7.1-OSX-64bit-10.6-x86_64-Darwin-app.dmg

in a terminal (changing the path as needed).  You should get 
129a710a286da6d99e46fa2607512d95 as noted on 
http://boxen.math.washington.edu/sage/osx/intel/index.html.  

Hopefully those will solve your problem, but if not let us know.

-Ivan

On Aug 28, 2011, at 8:05 PM, Questor wrote:

> menu "Terminal Session" > "Sage" gives
> 
> /Applications/Sage-4.7.1-OSX-64bit-10.6.app/Contents/Resources/sage/
> sage; exit
> % /Applications/Sage-4.7.1-OSX-64bit-10.6.app/Contents/Resources/sage/
> sage; exit
> ----------------------------------------------------------------------
> | Sage Version 4.7.1, Release Date: 2011-08-11                       |
> | Type notebook() for the GUI, and license() for information.        |
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>  File "/Applications/Sage-4.7.1-OSX-64bit-10.6.app/Contents/Resources/
> sage/local/bin/sage-location", line 226, in <module>
>    if install_moved():
>  File "/Applications/Sage-4.7.1-OSX-64bit-10.6.app/Contents/Resources/
> sage/local/bin/sage-location", line 77, in install_moved
>    write_location_file()
>  File "/Applications/Sage-4.7.1-OSX-64bit-10.6.app/Contents/Resources/
> sage/local/bin/sage-location", line 32, in write_location_file
>    O = open(location_file,'w')
> IOError: [Errno 13] Permission denied: '/Applications/Sage-4.7.1-
> OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/sage-current-
> location.txt'
> logout
> 
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