I'm using Logic Pro 9.1.5 on my MacBook Pro (2.4 Ghz CPU, 7200 RPM HDD). I have Snow Leopard.

When I'm doing nothing special, working on my project, Logic sometimes freezes and I'm stuck with a 'spinning wheel of death' for hours.

I uploaded a hang log file to see if someone can help me diagnose this and find a fix.
Hang log

  • What is your OS version? What steps are you performing that lead up to the problem?
    – bneely
    Dec 19, 2011 at 22:07
  • snow leopard...nothing special.working on my project and the logic freeze with the spinning wheel of death for hours.
    – peterpanx
    Dec 19, 2011 at 22:16
  • What audio interface are you using with Logic? Built-in audio in the MBP or a third-party external interface?
    – Ian C.
    Dec 20, 2011 at 0:59
  • built in yet...
    – peterpanx
    Dec 20, 2011 at 1:44
  • 1
    Have you tried upgrading to 9.1.7? There have been a number of hangs-on type bug fixes in the last two releases: support.apple.com/downloads/#logic pro
    – Ian C.
    Apr 19, 2012 at 17:23

3 Answers 3


Upgrade to the latest version of Logic Pro and try running the program in 32 bits mode (at least for testing purposes).

Do a "Get Info" on the /Applications/Logic Pro and tick the Open in 32 bit checkbox.

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I looked at your hang log (also called a sample). I have some experience reading samples for Mac OS X apps, and with Logic Pro 8. Unfortunately, I can't determine the problem from your log file.

If this problem is fully reproducible, it sounds like a bug. There may be nothing you can do aside from work on a different project or a new project within Logic. If you haven't already, report this to Apple via http://bugreport.apple.com/ .

  • thi have already send up to 10 reports but nothing happen..i'm watching the console and i see something little bit strange for me,very often.the messege is:"error for object incorrect checksum for freed object object was probably modified after being freed *** set a breakpoint in malloc_error to debug" maybe has something to do with it..
    – peterpanx
    Dec 20, 2011 at 0:29

Please consider creating a backup first. Shutdown your mac and restart it in safe mode (on + shift). Check the HDD for defects - disk utility will be sufficient for a quick check up.

read the other comments and do updates. From your logfile i guess it might be the ram - the other options are quick to check for free so do it first. Replace ram if necessary!

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