I have been using 15 with MLion without problems since it was released.
I have not had trouble creating PDFs nor printing.
Things to check before re-installing:
1. Check the location to which you are saving the PDFs if you do not have write access (or the path is too long) to it that might be the cause for the crash. Try changing it to another place and try to publish PDFs from another file to see if it works.
2. Reset the printing system. You do this by going into Printing and Scan within System Preferences, control clicking the printer and select "Reset"
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As for rolling back to 10.7 it is trivial if you have a clone of the Hard disk (using either Superdupper! or Carbon Copy Cloner) just boot from that Hard disk.
You could reinstall 10.7 if you have your copy of the instaler and you have Time Machine BackUps that have not been converted to MLion.
If you have neither of those then it might be impossible to do and keep your data.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
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