PDF document is blank




When opening doc_A.pdf (say protected by policy A) on a particular PC, login screen is displayed. But after login, PDF remains blank. Nothing is displayed. PC has Adobe Reader 7.0, IE 6.0 & Windows 2000 Professional.

On opening doc_B.pdf (say protected by policy B ) on the same PC, document is displayed after login.

Please note that doc_A.pdf is displayed correctly for the same user on another PC. PC has same software & OS as above.

What could possibly cause the blank PDF? Is it some setting in Adobe Reader??