whmcs integration plugin , works intermittently

pls point ur browser to the url http://www.osw.co.in

click on the support tab on the top right corner to expose the login box. enter random unam/password and submit form.

it will throw the following error

Sorry this doesn't look like a WHMCS site at [http://www.osw.co.in/members/] Make sure your WHMCS Integration settings are pointing to the correct URL and that the WHMCS site is set for the Portal template in Setup | General.

same will happen if u try the domain search box.

however if you goto this page

click on a link or two , it works.

if now you goback to the home page and try to login or search for the domain, the integration starts to work as expected, via the two forms

i've added the url's for form submission,for the login and domain search.

please let me know if you can point me to the right direction.