Switching Printers

I know this should be simple, but… I have a script that selects the PDFWriter from within FileMaker and it works flawlessly. Whenever I use the simple script to select the LaserWriter, FileMaker locks up. I changed the script and left out ‘tell FileMaker’ and ran the script from the Finder and it worked once. But, it now locks up the Finder whenever I try to switch from the PDFWriter to LaserWriter.
Tired of crashing, Earl C.