We have several installations of FrameMaker 12.0.4.445 on Windows 7 64-bit. Two of our computers have a problem when trying to generate a QR code from the "Special" -> "Generate QR Code" menu item.
Instead of bringing up the dialog box, it immediately gets an error "Empty config file: C:\Users\{username}\AppData\Roaming\Adobe\FrameMaker\12\qrconf.xml".
This file does exist in that location. We checked the contents of the file against a machine that is working, and the file is identical between the working installation and the broken installation.