I thought double blind was a dead issue.
No one, regardless of which side of this fence they occupy, can assert that the knowledge of the test does not alter the very act of listening. One of the few things that J. Atkinson has said with which I agree.
If you hear a difference this difference exists. If you dont it doesnt. I dont try to convince anyone of anything and remain secure in my own experiences.
By the way, setting up a quasi-viable double blind test is not a simple undertaking.