Folks, TeXShop 2.45 released earlier today has a bug. You must save the source before typesetting. This is caused by a Lion bug fix which I should not have copied into the 2.43 code. TeXShop 2.46 returns to the old behavior. Use the Sparkle upgrade mechanism, or http://pages.uoregon.edu/koch/texshop/texshop.html Dick Koch