Including png-files in tex-files using pdflatex gives a core dump, if I
reinstall the previous version of libpng, there are no problems at all!
(This was in the 6.2beta release 1.92, I don't know whether the libpng
package has changed or not)
After installing the 6.2 release I've found out including png's with pdflatex
So considder this bug history!