This is a Leap Year bug with our print processor, WebClientPrint.
To fix, download and run wcpp-188.8.131.52.msi
The file is available here: http://neodynamic.com/downloads/wcpp/
Important: Try the .MSI file first.
The .EXE file will produce an error, as it requires that you first run the uninstall for WebClientPrint here:
C:\Program Files (x86)\Neodynamic\WCPP for Windows\v2.0\unins000
Please restart your browser after installing this file. Sorry for the inconvenience.
More info is available here: