Corrupted .png in courses/

Having just downloaded the latest code from svn trunk, I started to look
at the courses/ directory and was delighted to see all the documentation in
.lyx format. However, when I tried to export to pdflatex I discovered that
all the .png images in figs/ have damaged headers.

   They also do not display or convert.

Rich

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Richard B. Shepard, Ph.D. | The Environmental Permitting
Applied Ecosystem Services, Inc.(TM) | Accelerator
<http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863