SQL Function Returning a DATE failing on V6R1

["Lennon_s_j@xxxxxxxxxxx" <lennon_s_j@xxxxxxxxxxx>]

I have an RPG UDF that returns a date.  It worked on V5R3 and V5R4.  We 
went to V6R1 a a couple of months ago and it no longer works.

It is registered like this using RUNSQLSTM:

DROP FUNCTION SLENNON/DATE_MDY
;
CREATE FUNCTION SLENNON/DATE_MDY
        (INDATE  DECIMAL(8,0) )
        RETURNS DATE
        PARAMETER STYLE SQL
        LANGUAGE RPGLE
        NO SQL
        DETERMINISTIC
        EXTERNAL NAME 'SLENNON/DATE_SQL(DATE_MDY)'
        CALLED ON NULL INPUT
        NO EXTERNAL ACTION

I can watch the RPG code in the debugger and it returns a date and the 
null indicator is set to zero, but STRSQL (green screen) always shows 
the replacement value (+s).  SQuirreL (JBDC) always shows nulls.

What am I missing?  Something seems to have changed in V6R1...