Q: problem with  2013-001 security update: hangs forever

The Disk Utility found an inconsistency : invalid directory item count.

I have to repair the disk...

According to Disk Utility, I need to repair the disk, it was found an "invalid directory item count" error

Same story. That's disappointing. OS X is really losing the reliability it used to have.  An OS not able to install an update it's something not even seen in Windows... I will switch back to linux...

Hi, I solved the problem, and I had no need to reinstall. As I told you it was an issue with the python 2.6 interpreter. OS X is using the interpreter under /System/Library/Frameworks/Python.framework/...  and I

found that the executable file in /System/Library/Frameworks/Python.framework/Versions/2.6/bin

was the cause of the problem.

Then I made a symlink to /Library/Frameworks/Python.framework/Versions/2.6/bin/ it worked fine.

The puzzling thing is why the python interpreter under /System/Library/Frameworks/Python.framework/... was not working. If try to run it from the command line, the bash starts hanging (as the

installer), and the notifyd process is also executed and hanging.  I checked the if by chance I had accidentally modified the python interpreter under /System/Library/Frameworks/Python.framework/.. but all

the files have the same dates, a possibility is that there was some corruption of the disk in the physical region hosting that code.