he actualizado dropbox a la versión 27.4.22 en mi max con os x yosemite y no me deja iniciar dropbox

He estado usando Dropbox en mi max con os x yosemite sin problemas y desde que lo he actualizado a la versión 27.4.22 no me deja iniciar Dropbox y da un siguiente mensaje indicando que debe ser por un error de permisos o que la carpeta de inicio se encuentra en un recurso de red compartido, junto con eun fichero con el siguiente contenido: bn.BUILD_KEY: Dropbox bn.VERSION: 27.4.22 bn.DROPBOXEXT_VERSION: failed bn.is_frozen: True machine_id: failed pid: 891 ppid: 1 uid: 501 user_info: pwd.struct_passwd(pw_name='danielfrancocoronil', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Daniel Franco Coronil', pw_dir='/Users/danielfrancocoronil', pw_shell='/bin/bash') effective_user_info: pwd.struct_passwd(pw_name='danielfrancocoronil', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Daniel Franco Coronil', pw_dir='/Users/danielfrancocoronil', pw_shell='/bin/bash') euid: 501 gid: 20 egid: 20 group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'danielfrancocoronil', '_carddav', '_pcastagent', '_pcastserver', '_xgridagent', '_xgridcontroller']) effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'danielfrancocoronil', '_carddav', '_pcastagent', '_pcastserver', '_xgridagent', '_xgridcontroller']) DYLD_LIBRARY_PATH: None cwd: u'/' real_path='/' mode=040755 uid=0 gid=0 parent mode=040755 uid=0 gid=0 HOME: u'/Users/danielfrancocoronil' appdata: u'/Users/danielfrancocoronil/.dropbox/instance1' real_path=u'/Users/danielfrancocoronil/.dropbox/instance1' mode=040700 uid=501 gid=20 parent mode=040700 uid=501 gid=20 dropbox_path: u'/Users/danielfrancocoronil/Dropbox' real_path=u'/Users/danielfrancocoronil/Dropbox' mode=040700 uid=501 gid=20 parent mode=040755 uid=501 gid=20 sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox' real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox' mode=0100755 uid=501 gid=20 parent mode=040755 uid=501 gid=20 trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc' real_path='/Applications/Dropbox.app/Contents/Resources/python-resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc' not found parent not found tempdir: u'/var/folders/zq/k8sjy6r50px_fljn2cwmclrw0000gn/T' real_path=u'/private/var/folders/zq/k8sjy6r50px_fljn2cwmclrw0000gn/T' mode=040700 uid=501 gid=20 parent mode=040755 uid=501 gid=20 Traceback (most recent call last): File "dropbox/client/main.pyc", line 5637, in main_startup File "dropbox/client/main.pyc", line 2395, in run File "ui/common/uikit.pyc", line 602, in create_ui_kit File "ui/cocoa/uikit.pyc", line 50, in File "dropbox/client/ui/cocoa/tray_popup/tray_controller.pyc", line 56, in File "dropbox/client/ui/cocoa/tray_popup/tray_drop.pyc", line 41, in ImportError: cannot import name NSFilePromiseReceiver Muchas gracias por la atención