I have 2 brand new Apple iMac desktops running Adobe Reader. When the user opens a pdf with mixed page sizes and tries to print to a Lexmark XM7355 it will print all of the pages on letter size. I tried to search for a solution and on Adobe's support site and there is an article that describes almost exactly the same issue. It even had steps to fix it on a Mac. However, even after following the steps it still does not work.
Here is a link to the Adobe support page:https://helpx.adobe.com/acrobat/kb/print-mixed-page-sizes-acrobat.html.
I also found a similar post here on Spiceworks but they are using a PC. I don't think they ever found a fix either. I have tried updating to the latest Lexmark driver (for Mac). I can't figure out if the problem is with Adobe Reader or the Lexmark. For what it's worth there is also a Windows PC running...