How do I get rid of this error:
PDF inclusion: found PDF version <1.5>, but at most version <1. 4> allowed
I tried putting \pdfoptionpdfminorversion=5 after my preamble, but nothing happens.
(Edit added by Andrew Stacey):
I've seen this error in the following situation.
- I created some PDFs using TeXLive2010 with the most recent stable PGF/TikZ (in case it is relevant).
- I cropped these PDFs using
pdfcrop, again from TeXLive 2010. - I sent these to another person, who included them in their document with the
graphicxpackage. - That person used TeXLive 2009 to compile the document.
(I'll need a little time to dig out a MWE! I'll need to figure out how to switch between TL2010 and TL2009 on my machine.)

pdflatexare you using? – Martin Scharrer♦ Feb 22 '11 at 9:37logfile. Also check the PDF version of the resulting PDF. – Martin Scharrer♦ Feb 22 '11 at 9:49