I think this is a common problem with Mac users - there is a lot of info on this on TPT and comes up a lot on the message boards. I do not own a Mac, but these are the directions that TPT has given:
If you have a Mac, you may be opening it with a Mac program
called "Preview" and not even know it. Preview has documented problems
opening modern Adobe files. If you have a Mac, try opening Adobe
Reader first (rather than just clicking on the file), then open the
file within Adobe Reader. You may also choose to set the default
reader to Adobe Reader by following the instructions here.
To change the default reader on a Mac to Adobe:
Click on the icon of a PDF file type then choose File --> Get Info
You will see a dialog box labeled something like this "sample.pdf" Info
Near the bottom, you will see a section titled "Open With:"
That indicates what application on you Mac is the default.
Click on the pop-up to bring up the list of possible applications
and select Adobe Reader (whatever version is installed), then click
"Change All" to make it the default application for all .pdf files.
The OS will then ask you if you are sure, click "Continue."
Now the Mac will use Reader instead of Preview.
If that doesn't help, do a search for TPT and Mac and something will come up that will probably help. Like I said, this comes up often but it will work
August 9, 2013