I am writing a presentation in Beamer, and I am compiling using XeLaTeX. Some PDF images I include in my presentation have a weird behaviour: they show up correctly in Mac OS's Preview application, however they don't display on Adobe Reader.
Is there a way of solving this problem? Researching for a solution I saw that people solved this by forcing a specific PDF version. However I am not able to do that in XeLaTeX.
Actually I don't need the images to be included as vectorial graphics, a method to tell LaTeX to include them as raster would also be perfect.
Thanks in advance!