When using encfs to scramble a backup to an alternate media, the password gets
modified somehow during umount.Any further attempts to mount the media fail,
even if the password is correct.

I copy the password from keepass to a text file, then copy the password to the
terminal.You cannot directly copy from keepass to the terminal due to its
"secure storage and wiping"  feature with the clipboard. The password has not
been changed by me since initial creation of the encfs storage.

Yet:
Error decoding volume key, password incorrect

I am unable to mount the encrypted data.

The alternative is to use ecryptfs, which to my knowledge can only have ONE
mount.EncFS can have MANY. I already have a "Private" mount setup.ANY OTHER
mount will confuse ecryptfs.

Otherwise I am stuck with LUKS or CipherShed(Truecrypt), which I am assuming
require root access.

Control: tag 796601 +notreproducible
Control: severity 796601 important

Cannot reproduce. Please show a sample .encfs6.xml and matching password
or we cannot do much for you.

There is no keepass package in Debian. Do you mean keepassx or keepass2?

After using a terminal... seriously? Terminals hide a lot of "invisible"
but effective characters.

Regards,
Eduard.