Unapproved caller : Security Agent may only be invoked by Apple Software

You have to take the computer to the Apple store to have to checked out.

Genius Bar reservation

http://www.apple.com/retail/geniusbar/

Best.

Restart the computer in safe mode. Certain caches maintained by the system will be rebuilt.

Safe mode is much slower to start up than normal. The next normal startup may also be somewhat slow.

When the login screen appears, restart as usual (not in safe mode) and test. There's no need to log in while in safe mode.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t start in safe mode. In that case, ask for instructions.

There was a spate of this particular issue about a or so year ago. See, for example:

https://discussions.apple.com/thread/5600203?start=0&tstart=0

In many cases a faulty HDD cable was to blame so it is entirely possible that your disk(s) are to blame. If your Mac is eligible for a replacement I suggest you get it seen to, as recommended by dominic23.

C.

This fixed it for me:

1. Start on single user mode: Hit the CMD+S keys at start-up
2. At the line, type (after root):

   fsck -fy

   and hit the Enter key.
3. Mount the root drive by:

   mount -uw /

4. Remove the cache files by:

   rm -Rf /var/folders/*

5. Reboot by typing:

   reboot

   .

Reference:

http://apple.stackexchange.com/questions/170971/how-to-approve-unapproved-caller -whilst-installing-the-software

Bravo Predro! Not only did this stop the Unapproved caller : Security Agent may only be invoked by Apple Software issue, this also got my severely stuck boot up problem to boot up! I spend 2 days on this. You are the man! Cheers. BOOKMARK THIS EVERYBODY!

Hi..I know this post is from the last year ..but I just went thru to all the problems that many people had here..including that famous "Unapproved caller : Security Agent may only be invoked by Apple Software"..and I did exactly like everybody else suggested and I couldn't find the problem..I couldn't empty the trash..and couldn't copy anything.. my computer was recently new..and I was about to install an update of El Capitan.. when everything went to freaking ****... I went to the Genius bar..twice ...and they checked it and passed with flying colors..all the hardware was fine..no explanation..so he erased the Main Drive and re-installed El Capitan..I came home and when I tried it ..the nightmare came back again in matter of minutes..everything was back again ..at some point didn't even recognize my login password...I try safe mode..it worked fine..but As soon I restart it nothing would work..black screens ..shout down by itself...I re-install el capitan 3 times and it would work for a minute and back again...so I downgrade to Lion..and It was working so good that I was happy..my computer was so fast that I couldn't believe it..I said to myself..I will stay with Lion I don't care as long my computer work..but you see..Im a video editor and when I try to re-install Final cut pro X ..it couldn't be install because the Osx version..it have to be at least Yosemite..so I install Yosemite because I have to...it works fine for about 30 minutes..I was happy ..till a new update for Yosemite appear..I installed it and everything when back to **** all over again..i was so disappointed..that at some point I though about breaking the **** computer...but I remember to see someone talking about the loose cable in the hard drive..so I went to checked it just for the **** of it and guess what???..the cable was loose..I don't know how it got loose..because I've been having my computer for about 6 months and It was working fine..and that's it ..I pushed it all the way down..until it clicked..that was this morning ..and Im writing this after I finished editing a video..and everything is working fine..Im still in Yosemite and I will stay with it until I have to go back to El capitan for some reason..but so far there is not reason for me to go there..so If someone is having all these problems please check the Cables..even if you think is crazy..Thanks ...

MacBook Pro (15-inch, Late 2011)...2.4 GHz Intel Core i7...16 GB 1333 MHz DDR3...Intel HD Graphics 3000 512 MB

Which cable did you check exactly? The Sata which goes to the SSD drive?

That is the way I read the post - the cable going to the hard drive.