I'm not able to really understand what JPGs are and what aren't compatible with the Pioneer AVH-X8500BHS.  I thought that as long as I was under the max resolution specified (4092x4092) I was safe, but that wasn't the case.  I loaded about 20 JPGs onto a SD card and only 7 of them were read.  I suspect this snippet from the owner's manual is the cause.  Can somebody who knows more about JPEG compatibility explain?