> This is the udf which comes with the firebird distribution (fbudf). I
> have verified the fbudf.sql. It is not declared with FREE_IT. I tried
> using FREE_IT, but then it stops working (it simply hangs).
>
> JS

Interesting: I use the old freeudflib and this is the typical DDL
DECLARE EXTERNAL FUNCTION F_ADDMONTH
DATE,
INTEGER
RETURNS DATE FREE_IT
ENTRY_POINT 'AddMonth' MODULE_NAME 'FreeUDFLib.dll'

I've never seen memory leaks with these functions. You could have found
something there.
Alan