Originally Posted by John VV
did those .png images have a alpha channel if so that might be the problem
open them in gimp and select
image / flatten
then hit " ctrl + s " to save
then re import the oo file and reexport it to pdf
gimp will also open pdf's
I have Gnome but for editing images I happily use KolourPaint. I just resized and cut some images with this program.
Don't know if they have an alpha channel... must look into it.
Also I must look if it is only the png-images that are missing...
Will get back on this later on this day.