With the change to Windows 8.1, the Pan Output mode in compatibility modes must be configured in a different way. In order to configure Pan Mode, the two panned outputs must be configured as an eyefinity group in the ATI catalyst control centre.
Details of this procedure can be found in the knowledge base section of support website at: www.Green-hippo.com/support
Once eyefinity is configured then start the Hippotizer V3 engine and set it to single mode, with the resolution of the group of displays. (3840 × 1080 for example for 2 – 1920 × 1080 outputs).
This will then function in pan mode.
On Boreal or Taiga, more outputs can be used as part of a Pan or Dual mode by adding more displays to the Eyefinity group.