Pdf won't display changes
I have made changes to a file in Adobe Pro X. When I save these changes I can see them on my screen and they appear to save properly. However, when I email this file to someone they are unable to view the changes. The changes made show as blank spaces. I searched around and found advice regarding merging layers or flattening. When I attempted this there were no separate layers to merge. This is for work so I need to figure this out a.s.a.p. if anyone can recommend a course of action.
Please note, when I emailed this to my boss he was able to view the file properly on his Mac but not on his iPhone. I need to know if the file is saved improperly of if it's just a lack of something on his phone.
iMac, Mac OS X (10.6.8)