Intersolv DataDirect Connect ODBC & Linux

I downloaded and installed Intersolv's (Merant's) DataDirect ODBC driver/driver mgr. for Linux (Red Hat 6.1). I already had a working 7.2 SE database on the same system. I defined the DSN (see attached odbc.ini) but all attempts to connect return the following error: NATIVE ERROR = -952 MSG = [INTERSOLV][ODBC Informix driver][Informix]User's password is not correct for the database server. I assume this user/password combination to mean the Linux login/password as I'm not aware of SE having any such authentication(?). The login/password pair are valid on the system (my account). I can connect to the database fine via dbaccess or isql, etc. What am I missing? Many thanks. -- Microsoft gives you Windows but Unix gives you the whole house!