Under certain circumstances, a perfectly legitimate procedure in diagram.tex will cause a useless warning to appear on the screen when used in latex2e, although not in latex2.09. The way to prevent this rather annoying warning is to add the line \let\@picture@warn\relax to diagram.tex, AFTER the line near the top that says \makeatletter I had been living with this warning for a couple years and I want to thank Richard Wood for having given me the clue necessary to track it down. Michael