[OS X TeX] Cannot change Tex Distrib. after upgrade to Maverics

[gsearby at free.fr]

Hi folks,

I have just upgraded from OSX 10.8.6 to Mavericks 10.9.2 and find I can no longer choose between my TEX distributions

After upgrading, all the distributions showed up in the TeX pref pane but non were selected (most recent was TexLive-2012). 
When I selected one, the system asked for an admin passwd and then replied « failure » (in French) on /usr/texbin.
So I then installed MacTeX-2013. The TexLive-2013 radio button in the pref pane is now active, but none of the others. 
The system still asks for a passwd when I try to select one, but nothing happens when I give it.

O.K. TexLive-2013 now works, and I know you will say that I should be happy with it, but I am co-authoring a book with a colleague, we are nearly finished and would like to be able to go back to TexLive-2012 so that we work with identical distributions (my colleague does not like updating software that has no problems). 
Has anyone else seen this problem? 

I see no problem with the PATH
echo $PATH
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/usr/texbin

/usr/texbin   points here:
ls -als texbin
8 lrwxr-xr-x  1 root  wheel  63 19 avr 09:51 texbin -> /Library/TeX/Distributions/.DefaultTeX/Contents/Programs/texbin

/Library/TeX/Distributions/ seems OK:
cd /Library/TeX/Distributions/
ls -als
total 64
 0 drwxr-xr-x  14 root  admin    476 18 avr 16:25 .
 0 drwxr-xr-x@  7 root  admin    238 18 avr 16:25 ..
 0 drwxr-xr-x   3 root  admin    102 18 avr 16:25 .DefaultTeX
 0 drwxr-xr-x  11 root  admin    374 18 avr 16:25 .FactoryDefaults
 0 drwxr-xr-x   3 root  admin    102 18 déc  2010 Fink-teTeX.texdist
 0 drwxr-xr-x   3 root  admin    102 17 déc  2011 MacPorts-TeXLive.texdist
 0 drwxr-xr-x   3 root  admin    102 18 déc  2010 MacPorts-teTeX.texdist
64 -rw-r--r--@  1 root  admin  31302 18 déc  2010 TeXDist-description.rtf
 0 drwxr-xr-x   3 root  admin    102 18 déc  2010 TeXLive-2010-64.texdist
 0 drwxr-xr-x   3 root  admin    102 18 déc  2010 TeXLive-2010.texdist
 0 drwxr-xr-x   3 root  admin    102 17 déc  2011 TeXLive-2011.texdist
 0 drwxr-xr-x   3 root  admin    102 14 déc  2012 TeXLive-2012.texdist
 0 drwxr-xr-x   3 root  admin    102 18 avr 16:25 TeXLive-2013.texdist
 0 drwxr-xr-x   3 root  admin    102 18 déc  2010 gwTeX-2003-2005.texdist

 Any Ideas anyone?

P.S. The cocoaspell pref panel was also broken by the upgrade,  but solved by re-installation

Thanks in advance,

Geoff Searby

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