solution:
in ~/.emacs
;;; A quick & ugly PATH solution to Emacs on Mac OSX (if (string-equal "darwin" (symbol-name system-type)) (setenv "PATH" (concat "/opt/local/bin:/opt/local/sbin:" (getenv "PATH"))))restart emacs
source
;;; A quick & ugly PATH solution to Emacs on Mac OSX (if (string-equal "darwin" (symbol-name system-type)) (setenv "PATH" (concat "/opt/local/bin:/opt/local/sbin:" (getenv "PATH"))))restart emacs
File->Input Devices...->Configuration untick the pen and eraser