Submitted for the Carrara General Knowledge / Live-And-Learn file:
Subcategory Mac vs. Carrara File:

I was having a problem with Carrara crashing at Open and Save dialogs. Specifically, C would open one file, then crash as I opened a second file. Or I would open a file, work on a shader, try to attach a texture map and crash as I pressed the Open button. Or I would work on a file, render, save the render (once), then crash if I tried to save-as (twice). I developed work-arounds for all of these, thinking it was a bug. At each crash Norton Crash Guard reported it as a "Bus Error Exception", making me think I just need to give C more memory (but it's taken all I have). I finally got around to troubleshooting it as an extension conflict - which it was.

Long story short, C conflicts with the Navigation 1.0.1 extension of Mac OS 8.1. This was probably fixed in OS 8.6, or OS 9, or X. Don't laugh at me, I'm still working with a 8500 with added G3/300 processor. I just wanted to share this because somebody, somewhere may have the same problem.