On Tue, 2 Jan 2018, Paul A. Rubin wrote:
Works fine for me (pdflatex, article class). Smaller argument values produce darker watermarks; and argument value of 1 makes the watermark invisible.
Paul, Yes, that's the problem: Page 3 of the doc notes, "Lightness of the watermark text (1=white, 0=black)." Well, foolish me read it backwards, so the smaller the fraction the darker rather than lighter. Sigh. It works. Rich