On Vista 64-bit, FileMaker hangs when I try to print using the PrinterSwitch (Amyuni) PDF driver.

The PrinterSwitch PDF Printer is installed by running install.bat in the myFMbutler folder in FileMaker’s Extensions folder.

As explained on the Amyuni forum, you should edit the batch file and change install -s "PrinterSwitch PDF Printer" to install -s "PrinterSwitch PDF Printer;NUL:". Then run install.bat