The creation/addition of NDMP sources fails when the password is pasted into the pop-up field.
Work Around:
The user can enter the password manually in the regular password field (not the popup), adding either a comma (",") or space (" ") at the end of the password.
Suppose the user introduces an invalid password before being able to add a new NDMP source. In that case, they will need to delete the invalid password from the configuration file manually.
etc/amanda/backupsetname/ndmp_filer_shares