Genexus X Ev. 3 - Problems reading Excel (xls)

Hello, I'm having a problem reading xls, just loading it and it appears at the bottom of the browser "Waiting for localhost (or the server)", I did the xlsx test with normal runs. I have tested in other browsers and other machines with different operating systems, but without success. I am using IIS7, generating .net, BD PostgreSQL, Genexus X Ev. 3 U9;