--- a/preamble.tex	Tue Aug 24 16:50:13 2010 -0700
+++ b/preamble.tex	Tue Aug 24 18:05:28 2010 -0700
@@ -21,6 +21,9 @@
 \hfuzz2pt % Don't report over-full h-boxes if over-edge is small
 % ----------------------------------------------------------------
 
+% don't warn about PDF 1.5 (default was 1.4); dangerous?
+\pdfminorversion=5
+
 % diagrams -------------------------------------------------------
 % figures ---------------------------------------------------------
 \newcommand{\pathtodiagrams}{\pathtotrunk diagrams/}