It finally happened! An LQS employee told me about a finished quilt they had made for the store where the red backing fabric bled badly. Before this honest discussion, my experience has always been that LQS people tell me that "high quality quilting fabric will not bleed" and that there is no need to pre-wash (at least not the fabric purchased from their store).
I appreciated the honesty and the fact that this store does carry Retayne!