Configuration changes don't stick

I’m using an XBee Series 1 with an adapter board from Adafruit and an FTDI cable, connecting to a Mac with OSX 10.7. I’m able to configure it using ZTerm, but when I take away the power the configuration goes back to the default settings (ID=3332, Baud=9600). This is the 3rd XBee module I’ve used, so I have some practice configuring and using them, but this one doesn’t act like the others. Any suggestions?

The problem is solved - I was not issuing ATWR command to write the configuration after I changed it. I don’t know why my other 2 XBees kept the configuration because I don’t think I used ATWR on those either!