unable to call function from a select statement

Hi,

I hope someone could help me figure out what's wrong with this.  I am trying to call a function via select statement (select function(param) from dual) and I am not getting an output on one of our server.  I have tried this on our devt environment and this is working fine.  I have also tried executing the function's script via anonymous block and I got an output from the server that wont initially produce the output.  Does anyone have an idea what's wrong with this?  Function is inside a package by the way and is owned by apps which is