FTP Script previously working, but no longer accepting correct credentials

Question

I have a functioning, automated FTP script that I have previously verified as functional, but as of today, when running the script, the machine is recognizing the username input, but not the password, giving the following output (reduced to show problem only):

331 User name okay, need password.

530 not logged in

For some reason, it's reading the command to pipe the username, but not the password, even though they are exactly the same, and in consecutive lines.

If it's worth anything, the file is saved on the machine's desktop, and I usually navigate to the directory through cd ~/Desktop

Here's the code, any help at all is appreciated:

#!/bin/bash

HOST=example.mydomain.com  
USER=user           
PASS=pass          

cd source/directory
ftp -inv $HOST << EOF
quote USER $USER
quote PASS $PASS
cd target/directory
put sampleFile.gz

exit

EOF

EDIT: I have seperately tried to ftp manually through ftp example.mydomain.com and the credentials are still correct.