Howdy, Latexmk 4.26 fixes a bug when using the biblatex 1.6 package with biber 0.9.4. If you are using the latexmk engines for TeXshop you can get the updated version as Latexmk426TeXShop.zip at <http:/public.me.com/herbs2>. Instructions for doing the update are included. Good Luck, Herb Schulz (herbs at wideopenwest dot com)