I installed Dropbox on Knoppix 7.0.5 via the apt-get command and downloaded the proprietary daemon software.
Then I set up my Dropbox account and found my files. In the directory /home/knoppix/.config/autostart I found a new file dropbox.desktop. It manages the startup of Dropbox after the user knoppix has logged in. Besides some other information it contains a line 'Exec=dropbox start -i'. In an LXTerminal I issued
Code:
man dropbox
and read about the options of the dropbox command. Afterwards I decided to edit the file /home/knoppix/.config/autostart/dropbox.desktop and to delete the option '-i' from the command string. I saved the file and rebooted the system. I was connected automatically to the Dropbox server without having been asked for the password.

I would suggest that you search for the dropbox.desktop file in the directory and edit the command string.

I hope that helps.