If print presets point to the wrong Distiller Library or Distiller Settings, your pdf print queue will stop or pdfs will not be created.  Check your com.apple.printer.custompresets.plist.  Use plutil -convert xml1 ~/Library/Preferences/com.apple.printer.custompresets.plist to convert it, then use sed to correct the plist. A telltale sign is choosing Adobe PDF 8 as your printer and printer specific options only shows dpi, not PDF Options.