Drupal Facebook inconsistant performance

Hi All,

I have installed & configure drupal for facebook module ......& I need the IFrame Approach to publish my application in Iframe at facebook

But this is the only available module which i can use for that purpose ...
but i have followed that it has some inconsistent behave as some times application runs under the iframe some time iframe is not coming(Specially when delte all cookie & history for new installation) instead entire application coming out(Drupal application with profile exchange)

Please advise me regard this

Nilanjan