Problem with XBEE configuration

I am trying to communicate between 2 arduinos using 2 xbee shields. I am trying to configure the Xbee shield with PAN ID, address etc. I am using X-CTU utility on a windows 7 64 bit operating system. I am able to configure one of the XBee modules with all the necessary parameters. I am not able to repeat the same for the other module.

I able to communicate to the Xbee shield for the first 20 seconds. During this 20 seconds, the light on the Xbee shield is ON. The xbee shield responds to the communication query test and the serial number is verified. I am not able to repeat the query test after the light goes OFF. Is my XBEE shield broken?

Hi,

Which Firmware version and function set is there on the second xbee module, on which you are reporting the issue?

I resolved the problem using the following this thread:

http://forums.digi.com/support/forum/viewthread_thread,597

Thanks!