Please post the details of the application release, database version and OS.
I am getting blank page ...i am able to long in and getting blank page after clicking any responsibility
Can you find any errors in Apache/Database/Application log files?
Please follow the steps in (Blank Page Accessing R12 - 'Missing class: _RF' in OACore application.log [ID 467562.1]) if you are on R12 and check then.
Please right click on the error page, View source the page.
copy the view source and paste it here, if you are not seeing any error, please enable fnd: enable debug and reproduce the error to get the view source.