I've tracked down a difference between Aquamacs 2.4, under which slime functions on OS X 10.6.8, and pre-test emacs 24.0.92:

Under Aquamacs version 2.4:

(open-network-stream "slime lisp" nil "127.0.0.1" 4005)

#<process slime lisp<1>>

Under Emacs.app 24.0.92 (9.0)

Debugger entered--Lisp error: (wrong-type-argument bufferp nil)

buffer-local-value(dbgp-buffer-process nil)

open-network-stream("slime lisp" nil "127.0.0.1" 4005)

eval((open-network-stream "slime lisp" nil "127.0.0.1" 4005) nil)

eval-last-sexp-1(t)

eval-last-sexp(t)

eval-print-last-sexp()

call-interactively(eval-print-last-sexp nil nil)

recursive-edit()

debug(error (wrong-type-argument bufferp nil))

buffer-local-value(dbgp-buffer-process nil)

open-network-stream("slime lisp" nil "127.0.0.1" 4005)

eval((open-network-stream "slime lisp" nil "127.0.0.1" 4005) nil)

eval-last-sexp-1(t)

eval-last-sexp(t)

eval-print-last-sexp()

call-interactively(eval-print-last-sexp nil nil)

Cliff Wulfman

cwulfman@Princeton.EDU