Ableton Forum

Ive just updated my Mac to OS 10.5.7 and its killed ableton live... crashes on launch.. anyone else have this?

I just updated to 10.5.7 last night and have had no issues besides the many bugs of Live 8so far.

Try repairing permissions. If that doesn't work zap the PRAM by restarting the computer and holding the option + command + P + R keys. Wait till you hear the startup chime 4 times (2 times by Apple's recommendation) and then release and let it boot up. Usually clears up most situations.

As always you can try deleting the preferences.cfg and template.als files located in users>library>preferences>ableton>Live 8.x.x

See also here - http://forum.ableton.com/viewtopic.php?f=1&t=114984 - for other experiences on 10.5.7... might be some useful info for you there, but I think none of them involved breaking Live, yours is the first I've heard... Swivet's suggestions are a good place to start...