Hi Miller
First, go to the Digidesign website and check that your version of
OS X is compatible with your version of PTLE. Read all the info/advice on the site. If
needs be, visit the Digidesign forum
here. You'll find lots of tips about settings which might improve
performance. Try searching through the posts (for example, searching for the error code
you've been getting) because you may find you don't need to start a new thread.
You don't say which G4 you have or how much RAM is installed - this might be the
problem.
Really swap-up on PTLE and the details of your machine and you
should find you can get around these issues.