XBP24BZ7 and Win XP

I brought in my 900mhz versions to work, developed the host/client software and they operate very well.
The company I work for liked the concept and bought 2 of the above to use.

With the XBP24BZ7, If I start them independantly via X-CTU, then sometimes, I can connect.
Usually they will not. If I reset them then I can read the info on board at 9600, but cannot write to them with out another reset.
If I try opening both on the same machine? No connection at all. I have one set for Coordinator and the other as an end device.

Is there something I am missing in the set up?