After further investigation, I found that the crossdomain script is calling a wrong url:
22 False +4.040 s 0.079 s GET 200 428 text/html http://cutesoft.net/CuteSoft_Client/CuteChat/SupportCustomerHandler.ashx?_temp=1203114378165&Type=VISIT&Referrer=
23 False +14.133 s 0.110 s GET 200 428 text/html http://cutesoft.net/CuteSoft_Client/CuteChat/SupportCustomerHandler.ashx?_temp=1203114388258&Type=VISIT&Referrer=
24 False +24.258 s 0.046 s GET 200 428 text/html http://cutesoft.net/CuteSoft_Client/CuteChat/SupportCustomerHandler.ashx?_temp=1203114398367&Type=VISIT&Referrer=
Sounds like a minor bug ?