GNU Screen (screen) behaves differently on OS X 10.5 (Leopard) and 10.6 (Snow Leopard) compared to Linux (at least Ubuntu, Red Hat, and Gentoo) and OS X 10.4 (Tiger). In 10.5 and 10.6, new screens (made with screen or ^A c) always places me in my home directory ~. In Linux and OS X Tiger, new screens have a pwd of wherever the screen was created originally.

Made up examples to illustrate what I mean:

Tiger:

$ cd ~/foo
$ pwd
/Users/ben/foo
$ screen
$ pwd
/Users/ben/foo
$ screen # or ^A c
$ pwd
/Users/ben/foo

Leopard, Snow Leopard:

$ cd ~/foo
$ pwd
/Users/ben/foo
$ screen
$ pwd
/Users/ben
$ screen # or ^A c
$ pwd
/Users/ben

How do I get Leopard and Snow Leopard to behave like Tiger used to?