Assignments- Students unable to attach files in assignments.

To Replicate the issue:
1. Login as instructor.
2. Create an assignment with Student Submissions: Attachments only and, post it.
3. login as student click on the assignment.
4. Add an attachment by clicking on "Choose file".
5. The file is not attached and a message is displayed on the top of page saying "student doesn't have permission to add resources".

http://www.evernote.com/shard/s657/sh/268faba6-2f55-4ffe-b6f3-0a8cd76603b3/5b516110b80feb07bca06d8f3e83d0b1

Note: Looks good in QA01 and trunk. However, it is not working in Rc02