I'm experiencing a problem while submitting the xform in CMS 5 , R2 . If I setup the form as

1 .User requires login 

2.  Form cannot be posted multiple times .

Whenever I try post the form it rasied error 'You must be logged in to answer' . Whereas I'm already logged in and it does not post any data .

If I turn off the validation , it doesn't raise any error message but also does not save form data .

I believe the second time it should raise the error message 'You have already filled in this form'

I  strip off my custom code and using the 100% episerver default code  - but still getting the error