comunication problem between AP and ED in demo version1.05

When I changed the ez430-RF2500 Wireless Sensor demo code version from 1.02 to 1.05 (both AP and ED). The AP device cannot get signal from ED. The both LED in ED device keep blink (looks it not find the access point). the sensor monitor only show local temperature resding. But when I change back to older version. every ting is ok. I repeated this change several times. the results are the same. Do I need change some setting in IAR when I make this change?