I am certainly no expert, and Denny, I appreciate your experience. Yours is the first account I've heard of a real problem. The warnings I've read or heard usually had the word "may" in them. I don't know why, but I've been doing protein rests for awhile now, about 7 batches worth, and haven't had a problem. In fact, when I pour a draft, the head stays put while the liquid line rises. The lacing is thick, and when I swirl the glass after it's been sitting for a long while, the head returns readily. That's not bad is it?