If you start experiencing the following error while running a transformation that output PDF and your Preview window does not load, you may need to change your Acrobat Reader settings
Exists Stylus Studio and open Acrobat Reader then navigate to Edit -> Preferences… -> Security (Enhanced) and un-check “Enable Protected Mode at startup”, click Yes into the warning dialog then exit Acrobat Reader.
Page rendered at Sunday, September 15, 2019 4:49:18 PM (Eastern Daylight Time, UTC-04:00)