Hi Sunil,
If it is specific to the user and not for all the users, then it must be a desktop/browser issue.
Please advise the user to create a shopping cart with OD punchout catalog in his/her colleague system where the other user is able to create the shopping cart with the same OD catalog without any issue.
With that, you will be able to confirm that it is a desktop/browser issue and not a User id/SRM settings issue. I have faced the similar kind of issue when the user logs in Citrix where they used to get this blank page. Finally the desktop team of that user has came to the rescue.
Please advise.
Best Regards,
Bharathi