Blank screens when recording


I ecently downloaded loadrunner 12.53 . My application is a web based application. When trying to record my application with socket level recording using http/html once i enter the crendentials in my application i just saw a blank screen nothing comes up but the i see it as recording . So i selected winlevel recording and started recorded i am able to record my application without any blank screen but i see that there is no events recorded and script is not generate. Can you please hel me. Thank you