Up until recently I have not had any problems using custom size (normally arch D), and using the 'save to pdf' on my mac book.   But last week it started beachballing on me whenever I click on the 'save to pdf' tab.  I can do a print preview which brings up an adobe pdf view of the page, I can save that file from the adobe menu.  But just printing from the print pdf - save as pdf I get beachball and an application not responding error.  I have to force quit autocad to recover.  Last night I lost an hour or so of work from this - even though the backup is set for every 5 minutes.

I can't think of anything I've changed.

I've read about having to delete the printer to stop this - which I have not tried.  I'm hoping this isn't something that has to be done everytime you need to save a pdf file.  It would would be onerous and very problematic ito install and delete the printer everytime I need to print something.  

The printer I default to does get used for 11x17 printing - but even then I usually just save the pdf files and print them outside of autocad.

Complete system is a macbook pro 15" mid 2010, 8GB int mem, 500gb SSD, 32" Benq monitor, HP Photosmart B8550 usb printer, Yosemite OS. I'm running Autocad Lite for mac 2015.  I also have a Xerox phaser printer via wireless.

I have not tried batch printing - I've never used it and am not familiar with it. I did read up on a bit last night and will give that a try.