Yes, the problem was the org-agenda-files. I don't understand though because it is setted to files in the dropbox folder, so it should work in all machines. The path to dropbox is setted in each machine.

2012/8/16 Bastien <bzg@altern.org>
Hi Humberto,

Humberto Henrique <humbhenri@gmail.com> writes:

> I don't know what's going on, but when I launch org-mode in one of my
> machines in home it thinks I am at work. 
> If I launch org-mode by M-x org-mode, it prompts with a ftp password
> for my machine at work.
> My .emacs config is synced via dropbox on these machines.
> Where is the option to disable this behavior.

Shooting in the dark: check your `org-agenda-files' in the .emacs.el,
to see if the path is correct for both machines.

--
 Bastien



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:.Humberto Pinheiro.: