Q: I get a bus error when running the external or batch renderer.
A: Update the prebinding of dynamic libraries by running the following command from a terminal:

sudo update_prebinding -root / -force

Q: I've uninstalled Turtle and my Maya environment variables seems to be broken.

A: Older versions of Turtle added environment variables to the file .MacOSX/environment.plist in your home directory. Note that this is a hidden file so you might need some extra work to edit it.

To edit it, open the terminal and type:

open ~/.MacOSX/environment.plist

It should be possible to remove the last traces of Turtle by editing the data in this file. Newer versions of Turtle do not modify .MacOSX/environment.plist