The Logic Bible of Troubleshooting Version 1.2

These are additional comments from users at the Apple Discussion Forum

* Appolon Chap Noel
Run Only Logic when troubleshooting ,check your 3rd Party items. (Ext. Drives- any external connections)

Please, remove iSight when running Logic that can cause FireWire bottlenecking.
No FireWire Daisy-chain, use a fireWire Hub.
Reset PRAM ( Command Option+RP )
Remove your 3rd Party RAM chips
Keep your drivers up-to-date.

Last Resort - Reinstall your OS from a Zero-out formatted drive

* Eddy Currents
Consider 3rd party plugin preferences corruption and rerun your au managers vaidation.
To rerun your au managers validation just go to Logic Pro ---> Preferences ---> Start AU Manager, then click Reset & Rescan All.

* Bashar Eweis
I have definitely found that if a plugin crashes validation do not use it. I have inflator from sony. It did not pass validation but I continued to use it anyway (God I love their plugins..) I ended up crashing more then I ever did. even though I didn't even have the plugin used on the track (Yet). Once I disabled it. I was good to go....

* Steven Von Kampen
Some 3d party plugs can pass validation and STILL CRASH Logic........so run a session with even the validated 3d party plugs turned OFF!
(waves was like this for a while....they passed validation but caused L7 to crash)

ps: make sure you check the sites of ALL your 3d party plugs for info on compatibility with your OS!

* James Closs
Set up a new (clean) user account and run Logic from that. This has worked wonders for me in the past. Not only can it point to the fact that it's your software config that's at fault rather than yr hardware but it gives you a working rig until you have time to troubleshoot properly!

* Appolon Chap Noel
M-audio units:
Remove in Tiger:
MAudioDeltaFamilyJaguar.kext and the MAudioDeltaHTJaguar.kext
Located at: ~/Library/Starupitems/M-Audio PCI Audio Helper

1. Some of the settings from L7 has changed in L7.1 templates. Please be advise.

2. Do Not recorded any part with Plugins Compensation activated to "All"

* David Slater
Here is something on the FCP forum that as helped with the program slowing down or crashing at start up.

" Updating the Prebinding"

Sometimes, for some (apparently) inexplicable reason, your computer slows down to a crawl after you have installed a big application.

In that case, you may want to "update the prebinding." This means forcing Mac OS X to go through all of the application files and make sure that they are correctly linked together. The Mac OS X default installer usually takes care of this by itself, but some third-party installers may be less cautious.

To do this, simply open your Terminal and type:
sudo update_prebinding -root / -force
Then, enter return, type your password, and enter return again.
Don't worry about the lines of text that will scroll on your Terminal. This simply means that the command is doing its work.
The whole process should only take a few minutes. However, it will considerably slow your computer down and for maximum efficiency, you should not use it at the same time.
Once the command has exited, immediately reboot your computer.
Not saying this will fix everything/anything but it is something to try

(terminal is a command line interface for unix (sorta like c:\ for dos)

terminal is located at ~/applications/utilities/terminal

Thanks to everyone for their interest and support in this check list. Points to all!

These are some comments from David Eager I thought especially helpfull....

To optimize Mac OS X Performance........

The main thing you can do is make sure you have plenty of free drive space. (at least 10Gb or so on the startup, for the swapfile etc and at least 30% free on all drives, for better drive performance)
Make sure you have plenty of RAM (1Gb or more)
Run maintenance utilities (like Cocktail or OnyX etc.)
Force prebinding. (search these pages for more on how to do that.)
Remove any excess MIDI drivers. (sometimes MIDI drivers for hardware you don't have can be installed)
Restart the computer on a regular basis (to flush the swapfile)